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.”
/ • CONFIDENTIAL -Incident No. Date 1 g Jul 47 ; la g Jnl 47 lb e Jul 47 le g Jul 47 ld g Jul 47 le g Jul 47 2 g Jnl 47 ~ 7 Jul 47 4 $ Jul 47 5 4 Jul 47 6 4 Jul 47 7 4 Jlll .47 ~ 4 Jul 47 9 4 Jul 47 10 4 Jul 47 ll 4 Jul 47 12 4 Jul 47 1~ 4 Jul 47 14 4 Jul 47 15 4 Jul 47 l.6 4 Jul 47 17 2ll. Jun 47 l!S not stated 20 Oot 47 20 19 20 Oct 47 Hour 0930 0930 0930 09tl9 1000 1000 1200 1010 1150 1305 1305 1305 1305 1305 2004 N<>• Obser,ed Location Sighted P'rom Muroc ilT Field, M'uroc, Calif. Muroc,Air Field, Muroc, Cali£. Muroc Air li'ield, li&uroc, Cali.f. Muroc .lir Field, lluroc, Calif. lmroc Air Field, Muroc, Calif. Uuroc A.Lr Field, itiuroc, Calif. Muroc Air Field, Mu.roe, Call!. Iifuroc Air Field, Vuroc, Calif. Area 113, Rogers Dry Lake, Muroc Air Field, Muroc, Calif. ~ortland, Oregon 1llli.lwaukee, Oregon Portland, Oregon Portland, Uregon Portland, Oregon undetermined wt atated Roi se, Idaho 5 Air 2 Ground 2 Ground 2 Ground 2 Ground 3 Ground 3 Ground 1 Ground 1 Ground l Ground 5 Ground 3 Grotmd 1 Ground 3 Ground not stated Seattle, Xashington l r.:.round 1305 Vancouver, Washington 20-30 Ground 1400 Portland, Oregon 4 Ground 16}0 Portland, Oregon 1 Ground 1700 Portland, Oregon 3 Ground ll.00 Mount Jefferson near 4 Ground Redmon, Oregon 1500 14t. Rainier, a.shington 9 11r not stated Toronto, Canada 1 Ground 1320 Dayton, Ohio 2 Ground 1100 Xenia, Onio • l Ground 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.