Documents / Report
This August 1949 technical report from the US Air Force Air Materiel Command presents Project Grudge's investigation of unidentified flying objects through January 1949. Drawing on consultants including Dr. J. A. Hynek, Rand Corporation, the Air Weather Service and Dr. P. M. Fitts, it explains most of 244 incidents as balloons, aircraft, astronomical phenomena, hoaxes or psychological errors. It concludes the objects pose no direct threat to national security and recommends reducing the investigation in scope.
SUBJECT: Project "SIGN" Chief, Air Traffic Service, Andrews Air Force Base, Washington 25, D. C. ATTN: DF3 1. Project "SIGE" is responsible for the collection, investigation and interpretation of data relative to sighting of undeclassified flying objects. Attached Incident Surveys 1 thru 172 from the files of Project "SIGH" are forwarded for study and recommendations as to which of the incidents may be illuminated as balloons released on routine synoptic ascents by the Air Weather Service, the Safety Aerological Service or the United States Weather Bureau. The observations attached may be retained in your headquarters for working and reference purposes. 2. The Air Weather Service is the only agency of its type that has been asked to assist in the analysis of Project "SIGE" except that the United States Weather Bureau has provided information on ball lightning. Research projects in which balloons are used and which are conducted or sponsored by the Army, Navy or United States Air Force are checked by the Intelligence Department of this Command. These checks are usually made direct from the Project "SIGE" Office, NO. LUC-3. These checks are distinct from the check of synoptic balloon flights made by weather service stations of the Air Force, the Navy and the Department of Commerce. (U.8. Weather Bureau) requested of Air Weather Service. 3. It is the opinion of this office that the below listed incidents are those having the greatest possibility of being balloons. This list does not eliminate the possibility that many of the remaining incidents are balloons. 2 84 90 91 113 155 3 25 92 92 115 156 4 24 72 96 126 157 11 30 73 104 111 159 14 31 61 105 112 163 16 52 87 107,6,9 151 167 22 33 89 112(3mm122) 194 169 23 48
Report, from the classic collection. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 413 pages are in the text index: search them above, or from the library's search.