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.”
31 CO~FIDENTIAL e No. Sighted l~ 1 2 l l l l 10 1 l l 1 l 1 1 1 1 1 1 1 1 l , ~l ,l - I. ~ \ \\ I Observed From not stated Ground Ground Ground Ground Ground Ground Ground Ground Oroum Ground Ground Ground llr Ground Ground . Ground Ground Ground ~ Ground Ground Boat Incident No. Date 21 29 Jun 47 22 21 Jwi 47 23 30 Jun 47 24 12 J\111 47 25 4 Jul 47 26 10 Jul 47 ~ 10 Jul 47 2g 24 Jun 47 29 23 Jun 47 30 7 Jan 4! 30a 7 Jan 4g 30b 7 Jan 4a 30c 7 Jan 4g 1946 32 32 not stated 33c 33d 33e 331' 33g 34 35 7 Jan 41! 7 Jan~ 7 Jan~ 7 Jan 4g 7 Jan 4a 7 Jan 4g 7 Jan~ 7 Jan~ 13 Oct 47 12 Nov 41 dour 1645 about noon 1745 1&5 2345 not stated ~ not stated not stated Location Des Moines, 1owa Spokane, ·1ashingt,on Boise, Idaho Weiser, Idaho Vfest Trenton, t~ . J. Harmon Field, Newfoundland Hamon Field, bewfoundland Idaho Bakersfield., Calif. l~T Lockbourne AB, Co1umbus, Ohio 1925EST Lockbourne,!B, Columbus., Ohio 1915EST Lockbourne AB, Columbus, Ohio 1940 Lockbourne il, Columbus, Ohio mid-December early a.m. Northern Arizona after dark Columbus , Ohio 133&.l'T,OO"' Oocbnan Field, Ky. (south of) l4000ST Godman Field, Ky. 1320CS'J.' · 0odman Field, Ky. J..420 CST 2100 from Oodman Field, Ky. J..430-1600 11!54-19()6 05}0 GQ'l.Jr a.m. Gedman Field, Ky. Godman Field, Ky. Godman Field., Ky. lladi.eomi-1.le, Ky. l4 mi1es north of Dauphin, J.lanitoba, Canada ticonderoga at sea (40 miles south of Cape dlanco, 20 miles o£f shore) CONFIDENTIALNND 927545
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.