Sighting Investigation Forms generated by Project SIGN
1. "Guide to Investigation: Unidentified Aerial Objects" (4 pp.)
2. "Essential Elements of Investigation: Unidentified Aerial Objects
(EEI)" (6 PP)
During the summer of 1948, Project SIGN began seeking radar-UFO
information from Air Force bases and facilities. The communications
included:
3. Letter to Tinker AFB, Oklahoma 18 June 48 (1
p.)
4. Reply from Tinker AFB 7 July 48 (2 pp.)
5. Letter from Watson Labs, Red Bank, N.J. 30
July 48 (1 p.)
http://www.nicap.org/docs/sign_480730.htm
Sighting investigation, Pittsburgh, Pa.
6. Letter 6 Aug 48 (2 pp.)
SIGN learned that Brig. Gen. Erik K. Nelson, AFRes, had knowledge of
UFO sightings over Sweden during 1948. An interview revealed that
objects seen over Scandinavia included cigars, discs, and "large,
ball-shaped object that could stop, hover, and go off at terrific
speed."
7. USAF letter to Brig. Gen. Nelson 27 Aug
48 (1 p.)
8. SIGN letter to USAF Hdq re:
interview 1 Oct 48 (2
pp.)
Sighting investigations, Los Angeles area
9. Letter to Procurement Field
Office 8 Sept
48 (2 pp.)
10. Letter to March AFB, Riverside, Calif. 8
Sept 48 (2 pp.)
Letters to Air Defense Command seeking radar data
11. Letter to Mitchel AFB, N.Y. 16 Sept 48 (1
p.)
http://www.nicap.org/docs/sign_480916.htm
12. Reply from Mitchel AFB 15 Oct 48 (1
p.) 10 to 50 % of targets on their scopes are unidentified!
http://www.nicap.org/docs/sign_481015.htm
Letters to other intelligence agencies requesting assistance in
identifying possible objects "of domestic origin."
13. Letter to CIA via Air Force Hdq 7 Oct
48 (2 pp.)
http://www.nicap.org/docs/sign_481007.htm
14. Letter to Director of Intelligence, Army 7 Oct
48 (1 p.)
http://www.nicap.org/docs/sign_481007c.htm
15. Letter to Office of Naval Intelligence 7
Oct 48 (1 p.)
http://www.nicap.org/docs/sign_481007d.htm
National and international instruction to all major commands "to be
particularly alerted at this time for sightings of unidentified aerial
objects..."
16. Air Force Hdq letter to SIGN 13 Oct
48 (1 p.)
http://www.nicap.org/docs/sign_481013.htm
Sighting investigation, New Orleans, La.
17. Letter to Army CIC detachment 18 Oct
48 (1 p.)
SIGN request for study by RAND Project; some UFOs possibly
"experimental spaceships."
18. Letter to Air Force Hdq 22 Oct 48 (2
pp.)
http://www.nicap.org/docs/sign_481022.htm
19. Letter to RAND Corporation 10 Jan 49
(1 p.)
http://www.nicap.org/docs/sign_490110.htm
Sighting investigation, South Bend, Ind.
20. Letter to 12th OSI District, Scott AFB, 111. 22 Oct 48
(1 p.)
21. Cover letter, OSI investigation report 5
Jan 49 (1 p.)
Sighting investigation, Chicago, 111.
22. Letter to Hdq Fifth Army,
Chicago 2 Nov
48 (1 p.)
23. Cover letter, Army investigation report 7 Jan
49 (1 p.)
http://www.nicap.org/docs/sign_490107.htm
Exchange between Maj. Gen. C.P. Cabell, Air Force Director of
Intelligence, and Project SIGN. Cabell stated, "The conclusion appears
inescapable that some type of flying object has been observed.
Identification and origin of these objects is not discernible to this
Headquarters."
24. Cabell letter to SIGN 3 Nov 48 (1 p.)
http://www.nicap.org/docs/sign_481103.htm
25. Col. McCoy reply to Chief of Staff
. 8 Nov 48 (3 pp.)
Sighting investigation, Neubiberg AFB, Germany
http://www.nicap.org/docs/sign_481108.htm
26. Letter re: 11 & 24 Oct 48
sightings 4 Nov 48 (1
p.)
Sighting investigation, F-61 radar-visual, 15 Oct 48, Japan
27. Letter to Far East Air Force commander 9
Nov 48 (2 pp.)
Correspondence with Dr. George E. Valley, Jr., M.I.T. and Air Force
Geophysical Lab, Cambridge, Mass.
28. Letter to Valley with UFO incident summaries 29 Nov 48
(2 pp.)
http://www.nicap.org/docs/sign_481129.htm
29. Follow-up letter to Valley 2 Dec 48
(1 p.)
http://www.nicap.org/docs/sign_481202.htm
30. Letter to Air Force Lab with summaries 6
Dec 48 (1 p.)
http://www.nicap.org/docs/sign_481206.htm
31. Follow-up letter to Air Force
Lab 21(?)Jan 49 (1 p.)
http://www.nicap.org/docs/sign_490121.htm
Communications with Hdq Air Defense Command (ADC) and Continental Air
Command (CAC), Mitchel AFB, N.Y., regarding radar UFO sightings,
especially those showing "unusual or outstanding flight
characteristics...." and directives for reporting.
32. Utter from Hdq, ADC 15 Oct 48 (1 p.)
http://www.nicap.org/docs/sign_481015.htm
33. Letter to Commanding General,
ADC 30 Nov 48 (2 pp.)
http://www.nicap.org/docs/sign_481130.htm
34. Letter from Hdq, CAC (with 12 Jan 49 reply) 3 Jan
49 (3 pp.)
http://www.nicap.org/docs/sign_490103.htm
35. Letter from Hdq, CAC 21 Feb 49 (1 p.)
http://www.nicap.org/docs/sign_490221.htm
Transmittal of SIGN incident summaries to Hdq, U.S. Air Force
36. Letter to Chief of Staff, Air Force, AFOIR 2 Dec
48 (1 p.)
http://www.nicap.org/docs/sign_481202.htm
Sighting investigation, 29 July 48, Indianapolis, Ind., Project SIGN
Incident #151
37. Query to General Electric Corp. 2 Dec
48 (1 p.)
Transmittal of SIGN incident summaries to Navy
38. Letter to Office of Naval Intelligence 13
Dec 48 (1 p.)
http://www.nicap.org/docs/sign_481213.htm
Contract for scientific consultant to investigate UFO reports
39. Letter to Dr. J. A. Hynek, Ohio State Univ. 20 Dec
48 (2 pp.)
http://www.nicap.org/docs/sign_481220.htm
Status reports to Hdq, Air Force, on UFO investigation at
Wright-Patterson AFB, Dayton, Ohio
40. Memorandum to Chief of Staff, Air Force 9
Feb 49 (2 pp.)
http://www.nicap.org/docs/sign_490209.htm
41. Memo to Director, R&D, re: Project GRUDGE 10 Mar
49 (2 pp.)
Transmittal of Project SIGN Technical Report No. F-TR-2274-IA,
"Unidentified Aerial Objects: Project 'Sign'" to R&D Board,
Washington, D.C.
http://www.nicap.org/docs/sign_490310.htm
42. Letter to Committee on Guided Missiles 19
May 49 (2 pp.)
http://www.nicap.org/docs/sign_490519.htm