FBI's 21-Year UAP Case File, Serial 403

Brief

The FBI opened and maintained case file 62-HQ-83894 from June 1947 through July 1968, accumulating investigative records, public reports, and firsthand testimony on UAP sightings across the United States. Among the most substantive materials are photographic evidence tied to the Oak Ridge, Tennessee nuclear complex and technical proposals addressing unconventional propulsion. The file also incorporates researcher convention programs and contemporaneous press coverage, suggesting the Bureau tracked civilian UAP inquiry as well as military-adjacent incidents. This release represents the complete case file with several newly declassified pages and only minor redactions — an improvement over the previously posted FBI Vault version, which carried heavier redactions and was missing pages.

Metadata

Agency

FBI

Release

5/8/26

Type

PDF • .pdf

Length

3 pages

Classification

UNCLASSIFIED

Tags

flying disc, UAP, Oak Ridge TN, 1947–1968, photographic evidence, propulsion research, nuclear site proximity

Key points

• The case file spans June 1947 to July 1968 — from the first modern wave of flying disc reports through the end of the Cold War's peak UAP documentation period.
• Photographic evidence from Oak Ridge, Tennessee is specifically cited, linking UAP activity to a major U.S. nuclear research and weapons production site.
• The file contains technical proposals concerning potential propulsion systems, indicating the Bureau collected or forwarded engineering-level speculation about the phenomenon.
• Eyewitness testimonies and public reports were formally incorporated into the case file, reflecting a broader intake posture than a purely internal investigation.
• Convention programs and researcher accounts appear in the file, showing the FBI monitored civilian UFO research communities.
• This release is more complete than the existing FBI Vault posting — several newly declassified pages are included and redactions are described as only minor.

Most interesting

• Oak Ridge, Tennessee housed the Y-12 and K-25 facilities central to U.S. nuclear weapons production — UAP sightings near such a site would have carried immediate national-security weight for the Bureau.
• The case file predates Project Blue Book's formal closure (1969) by one year, meaning FBI and Air Force investigative timelines ran largely parallel across this document's span.
• The inclusion of researcher convention programs suggests the Bureau treated civilian UFO organizations as subjects of surveillance, not just sources of tips.
• The gap between the previously posted FBI Vault version and this release — more redactions, missing pages — implies active suppression of specific content for decades beyond initial declassification.
• Technical propulsion proposals in a law-enforcement case file are unusual; their presence suggests the Bureau was a conduit for material that might otherwise have flowed exclusively to scientific or defense channels.