Documents / Official release
This FBI file serial from case 62-HQ-83894 holds several copies of Air Intelligence Requirements Memorandum Number 4, "Unconventional Aircraft." Major General C. P. Cabell, Director of Intelligence at Headquarters United States Air Force, issued the memorandum on 15 February 1949. It sets continuing Air Force requirements for information on unidentified flying objects, including "Flying Discs," and tells commands to send reports to Air Materiel Command at Wright-Patterson AFB. It also includes a detailed checklist covering sighting details, observers, radar data and physical evidence, and the FBI Director appears on its distribution list.
From the source:Release of 2026-05-08 Incident: N/A, N/A. The FBI's 62-HQ-83894 case file includes investigative records, eyewitness testimonies, and public reports concerning Unidentified Flying Objects and flying discs documented between June 1947 and July 1968. The records include high-profile incident accounts, photographic evidence from sites like Oak Ridge, TN, and technical proposals regarding potential propulsion systems. Additional topics include convention programs, researcher accounts, and extensive media coverage from the period. This file is partially posted on FBI vault with more redactions and some pages missing. Included here is the complete case file with several newly declassified pages and only minor redactions.
“King”1 page
RESTRICTED S. 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. 6. 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 aircrait 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 1f objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence wher e possible. 10. Was any radio antenna to be observed, i.e ., (any projections or extentlons that might presum ably be construed as such). cf-?~C. P . CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and overseas All United States Air Attaches Dir ector of Central IntelUgence Special Assistant for Research and Intelligence, Department of State Director o:f Intelllgence , GSUSA Chief of Naval Intelligence Commandant (!NT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 -
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Official release, from the pursue collection. The PDF is mirrored here; the original link is under it. 137 pages are in the text index: search them above, or from the library's search.