DEFE 31/173 — DI55 UFO Reports 1984–1986

Brief

The file bundles DI55 UAP intake forms and supporting incident reports routed from Air Force Operations to Defence Intelligence and the Air Secretariat. Of 444 pages, only four yielded machine-readable text; the remainder are scanned images beyond standard OCR reach. The legible material confirms a structured reporting framework capturing witness identity, meteorological conditions, and multi-node distribution — the same evidentiary architecture later formalized in the Condign study. One partially legible entry carries a military timestamp of 200030Z Nov 83, placing at least one incident in late 1983, just outside the file's nominal window.

Metadata

Agency

UK Ministry of Defence / Defence Intelligence Staff (DI55)

Release

2008-10-08

Type

PDF • .pdf

Length

444 pages

Classification

UNCLASSIFIED (on release)

Programs

DI55, Project Condign

Tags

UAP, UK-MoD, DI55, 1984, 1985, 1986, Project-Condign, intake-forms, 1983-overlap

Key points

• 444 pages total; only 4 carry extractable text — the overwhelming majority is image-only scanned documentation requiring vision-model processing to unlock.
• The standard intake form on page 28 routes copies to Sec(AS)2, AEW/GE, D155 File, and AF Ops, establishing DI55 as an active analytical node rather than a passive archive on the UAP intake chain.p.28
• The form template captures: reporting party (police, military, press), informant name and address, informant background, other witnesses, date and time of receipt, meteorological conditions, and remarks — a structured evidentiary framework.p.28
• The duty officer signature line identifies a Squadron Leader as the Duty Operations Officer at AF Ops, confirming officer-grade accountability for each intake.p.28
• Page 407 preserves a date/time/duration block reading 200030Z Nov 83 with a duration of 5 minutes — predating the file's nominal 1984–1986 window and suggesting either backlog intake or overlapping file boundaries.p.407

Verbatim

• Copies to: Sec(AS)2 AEW/GE D1 55 File AF Ops/l/ll

  p.28

• Squadron Leader Duty Operations Officer AF Ops

  p.28

• 200030Z Nov 83

  p.407

• 5 Minutes

  p.407

Most interesting

• The 200030Z timestamp is Zulu (UTC) military notation, placing the page 407 sighting at 8:30 p.m. UTC in late November 1983 — a data point that sits chronologically before the file's stated 1984–1986 coverage.
• With roughly 440 of 444 pages inaccessible to OCR, the analytical content of this volume remains effectively sealed without a dedicated vision-model pass across the full image set.
• The routing slip names DI55 alongside the Air Secretariat and the Airborne Early Warning / Ground Environment cell, showing UAP reports were simultaneously shared across intelligence, secretariat, and operational air-defense nodes in the mid-1980s MoD.
• The form field 'Any Unusual Meteorological Conditions' appears as a discrete required entry, reflecting standing MoD doctrine that atmospheric anomalies were a plausible mundane explanation requiring affirmative documentation on every report.