Documents / Case file
This is an initial Project Sign progress report dated April 1948, sent from Headquarters, Air Materiel Command at Wright-Patterson Air Force Base to the Chief of Staff, U.S. Air Force. It tabulates about 100 unidentified flying object reports received through February 1948, covering shape, size, number of objects, speed and exhaust trails. Dr. Irving Langmuir found the data insufficient for a positive identification. Headquarters judged that a low aspect ratio aircraft using boundary layer control could reproduce many of the reported characteristics.
From the source: Release of 2026-07-10 Incident: 1948, Various. This file contains an initial report from the Air Materiel Command regarding Project Sign. Project Sign was a 1948-1949 U.S. Air Force program to investigate the nature and origin of unidentified flying objects (UFO). The report details 100 UFO sightings from 1947-1948. The file also contains an article excerpted from “The Aeroplane,” an aviation-focused periodical magazine published between 1911 and 1968, titled “The Biology of the Flying Saucer.”
-Incident Ol>aeryer's 110. Opomtion IM!¥I8 £1 Yt•Hitr 57 Bridge Corustruct1on Bot stated Clear and dark. 58 Chiet Pilot- Not atated lfot auted Plying 1er-,1oe 59 Pilot Hone Rot stated 60 Storek:eepel" lot Stated Clear at duak 61 Kot stated lfone Wot stated 62 lot stated Not stated Cloudy 63 Hot stated BOYel"ing and fluttering, 1'1S1ng and deecendtng. Scattered aull olouda, 64 Executive Direct- Hor11onal OnNalt or ot Housing Authority. 65 P1lot lfot stated Not 1tated 66 Lt. Col, QSC Sc1ent1t1c Horizonal Pl1.g?\t lfot 1tated Branch Research Group. 67 Insurance Adjuster None Clear 68 Prospector Banking Cleu 69 Not stated Hot stated Not 1tated 70 Insurance Agent Not stated Clear 71 Capt. AC Reser-,es Not stated Clear 72 A1!S1 0tf1ce1' Not stated Cloud to1'118t1on 1oattered abOYe 10000 tt. 73 lavigator (Conatellat1on type ail"cNft) Not stated 5/l.O acattered cuaulus vith tops at 10000, Y111b111ty 10 a11H. 74 Prospector Standi.nc on edge and banking 1n the clouda. Mot 1tated 75 Trout Parm Oper. Rode up and dovn oyer the hills and hollow ot the canyon tloor. Mot stated County COlllliaaioner Hot stated Rot stated It NND 927545 76
Case file, from the pursue collection. The PDF is mirrored here; the original link is above. 45 pages are in the text index: search them above, or from the library's search.