Project Sign Progress Report, 1948

U.S. Department of War · 1948 · 45 pages · text from the file's own layer

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.”

Open the PDF at page 7 Original source ↗

80
85
90
95
100
coNriBcNTIAL
lno1dent Jo. °'8tl"Ytd
19, em.. Looat1op SUhtn rrw
1 Ground
81 7 Jul 47 0900 Biokaa Jield, lava11 1
82 171117 47 2030-2100 0klahOllll CitJ, OklahOJII 1 Ground
83 9 hl 47 1217 Bo1 ■t (Between Boise and 1
hr1d1&n) Idaho
z, 84 7 Jul 47 l:500•140<Bft Lakeland, Jlorida 5 Cll'ound
1200 Portland, oregon 10 Qromd
86 6 lulJ ~7 lot ■tated Hollywood, Cal1tonia l Qro,md
87 lot ,tated •ot 1tated HabMrbi1hopehiOJ1 {20 mile, 1 Ground
zx, r tb ) Gorm.any
88 S J.ug if Atternoon Baokenaaok, a. J. l Ground
89 6 Jul 47 lS45 lanaae City (100 miles west), l Air
Ke.neaa
29 Jun 47 1500-15:SO Lae Cruoe ■, !low Mexico l Groun4
91 28 Jun 41 2120-2146 Maxwell Pield, Alabama 1 Ground
• 92 lg Jun 47 l2l5-1Sl6 Colorado Springe, Colorado l Grcrund
ll Jan 48 l 1650 Harttord, Coumot1cut l Air
!O Deo 47 l926PSf Between Great l'alle, Montana l
and Pairfield, Ca!1tornia
SO Dec 47 l926PSf Rosedale, Oalitornia l A.ir
SO Deo 47 1926 Lov•look (30 m1lea weat), leTae1& l Ground
97 30 Dec 47 1926PST Between Medtord and •t. Chaata, l A1r
Oregon
98 2 l(oT 47 Daybreak Houston, Texas l Ground
~ Jan 46 lot stated Vasea, 11nland l Ground
5 Jan 46 lot 1tated Pretaraa&rl, F1nla1'ld l Ground

Cases discussed

The Kenneth Arnold Sighting 1947
Incident 17, 24 Jun 47, Mt. Rainier, Washington, 9 objects seen from air
The Maury Island Incident 1947
Incident 43, 29 Jun 47, 175-250 ft diameter, inverted saucer, harbor pilot
United Air Lines Flight 105 Sighting, Emmett, Idaho 1947
Incident 10, Capt, United Airlines, horizontal flight at airline speed
Twin Falls saucer hoax 1947
Incident 64, 19 Aug 47, Twin Falls, Idaho
Snake River Canyon Disc: The A.C. Urie Sighting 1947
Incident 75, Snake River Canyon, Idaho, trout farm operator
Muroc Army Air Field disc sightings 1947
Incidents 1 to 1e, 8 Jul 47, Muroc Air Field, Area 113, Rogers Dry Lake
The 1947 Flying Disc Craze: America's First Flying Saucer Wave 1947
Tabulation of many June to August 1947 flying disc reports across the US
The Mantell UFO Incident 1948
Incident 33, 7 Jan 48, Godman Field, Ky., Capt USAF Flight Leader

About this file

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.