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.
RESTRICTED
3. Local flight schedules of commercial, private and military aircra!t flying 1n vicinity at the
time. (Check Canadian activity 1f close to that border.)
4. Possible releases of testing devices 1n 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 s pot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. 11 object came sufficiently near other alrcra!t or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected a1rcra!t 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 mor e than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence wher e possible.
10. Was any radio antenna to be observed, Le ., (any projections or extentl.ons that might presum
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Sta!f, 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 Intelllgence, GSUSA
Chief of Naval Intelligence
Commandant {INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRI CTED - 7 - Not linked to a story yet.
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.