DISCLOSURE / FILE
FBI case file 62-HQ-83894 Serial 164 reproduces three copies of Air Intelligence Requirements Memorandum Number 4 (15 February 1949), the USAF directive establishing standing reporting requirements for sightings of unconventional aircraft and so-called 'Flying Discs.'
65_HS1-834228961_62-HQ-83894_Serial_164
FBI case file 62-HQ-83894 Serial 164 reproduces three copies of Air Intelligence Requirements Memorandum Number 4 (15 February 1949), the USAF directive establishing standing reporting requirements for sightings of unconventional aircraft and so-called 'Flying Discs.'
This serial preserves Air Intelligence Requirements Memorandum Number 4, issued 15 February 1949 by Major General C. P. Cabell, Director of Intelligence at Headquarters United States Air Force. The memorandum supersedes Department of the Army Collection Memorandum Number 7 (21 January 1948) and CSGID 425.1 (25 March 1948), routes initial reports by electrical transmission to the Director of Intelligence with copies to Air Materiel Command at Wright-Patterson AFB (ATTN: MCIAXO-3), and specifies a 20-item observational template covering shape, propulsion, exhaust, radar behavior, and disappearance, plus instructions to collect soil samples, Geiger-counter readings, photographs, and signed witness statements. Distribution includes the Director of Central Intelligence, the Chief of Naval Intelligence, the State Department, the Coast Guard, and the Director of the FBI. The file is marked RESTRICTED on every page and bears FBI case marking 62-83894-164 with FOIPA # 1142292.
To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."p.2
As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.p.2
Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."p.2
If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils.p.8
If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity.p.8
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.p.4
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.p.2
Extracted text · Page 1
Page 1 · vision OCR
FBI - CENTRAL RECORDS CENTER HQ - HEADQUARTERS Class / Case # 0052 83894 Sub 1 Vol. Serial # 164 ONLY 8/11/12274166 REF-030XGBS 62- Serials EBF 164 62-HQ-83894-EBF 164 HQ-83894 EBF [red plus symbol] DO NOT DESTROY DO NOT DESTROY FOIPA # 1142292 62-83894-164 ENCL Behind FILE Declassification authority derived from FBI Automatic Declassification Guide, issued May 24, 2007. additional copies behind file
Page 2 · vision OCR
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
additional
copies
behind file
62-83894-164
ENCLOSURE
RESTRICTED C9-4892,AFPage 137 · vision OCR
RESTRICTED RESTRICTED
Concatenated page-by-page transcript. Born-digital pages came through pdf.js; scanned pages were transcribed by Claude vision OCR. Pages marked unreadable failed multiple OCR retries (heavy redaction, microfilm artifacts, or blank separators) and are kept in place for audit.
FBI - CENTRAL RECORDS CENTER HQ - HEADQUARTERS Class / Case # 0052 83894 Sub 1 Vol. Serial # 164 ONLY 8/11/12274166 REF-030XGBS 62- Serials EBF 164 62-HQ-83894-EBF 164 HQ-83894 EBF [red plus symbol] DO NOT DESTROY DO NOT DESTROY FOIPA # 1142292 62-83894-164 ENCL Behind FILE Declassification authority derived from FBI Automatic Declassification Guide, issued May 24, 2007. additional copies behind file
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
additional
copies
behind file
62-83894-164
ENCLOSURE
RESTRICTED C9-4892,AFRESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiving information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instructions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the development of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Command.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presumably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
62-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiving information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instructions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the development of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Command.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (ballcon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presumably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
62- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiving information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instructions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the development of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Command.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
62-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiving information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instructions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the development of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Command.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presumably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiving information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instructions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the development of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Command.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or verical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presumably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procurable, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelligence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiving information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instructions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the development of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Command.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (ballcon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
62- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Material Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
·b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
·b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
·b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65-83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
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b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
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c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs."
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."
RESTRICTED C9-4892,AF
65- 83894-164RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer's position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2 - RESTRICTEDRESTRICTED
b. Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer's aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer's view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
b. Length and width.
RESTRICTED - 3 -RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
- 4 - RESTRICTEDRESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED - 5 -RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 6 - RESTRICTEDRESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C.P.Cabell
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED - 7 -RESTRICTED RESTRICTED