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.”
In.ctdent Ko, 77 78 79 80 81 82 83 ~ 85 86 87 88 89 90 91 92 95 96 97 98 99 10 0 Ob ■erTer'• Qo9upgt109 Astronomer Lt, USI (P80 Pilot Weather r-,o7tff Lt. Col. USAP C1T11 Service bplo,ee P1eld Bngtn,er Pilot Sign Painter Pl'1Tate Pilot Hot 1tated U. S. Army Not stated Major, USAF Administrative Asst, Rocket Sonde Section Captain Railroad Employees Capt, USAP L~ Col, Hq, EPlf C-47 orew Bot stated Airplane crew Immigration Service Not stated lfot stated Manemrp Not stated lot 1t1ted Rot 1t1ted Jot ltated A1oendtng slowly Bot stated Slow roll or barrel Cl1Jlb1ng lot stated 'l'm"ned a corner and seemed to roll. Descended slowly and then dropped in a spiral motion, Not stated dot stated Not at~ted Trave ling in zig-zag course Climbing, diving and reversal of direction whioh happened enry few aeoonds. Shooting toward, the eaat at 45° angle Descending vertically - aeaned to slow down on nearing the earth Not sta.ted Bot stated Not stated Appeared to be spinning in its descent Bot atated ?lot stated I LNND 927545 J!eather lot stated lot ■ tated Clear Scattered clouds Y111b111t7 10-12 ailea. lot stated S<ae clouds Clear ...cattered cloud• lot stated Clear ~ot stated Not stated Clear Clear Cle ar alld 1unny Not stated •ot 1tated Not stated Not stated tiot &tnted lot stated lot stated Not ata.ted
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.