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.
## 1. Astronomical # INCILIENT INDEX 4. High probability: 24, 27, 30, 31, 32, 33, 34, 40, 49, 50, 60, 66, 69, 70, 94, 95, 96, 97, 98, 101, 102, 103, 104, 116, 119, 132, 136, 140, 147, 148, 156, 174, 184, 18b, 167, 197, 203, 204, 206, 216, 219, 238. b. Fair or low probability: 19, 20, 23, 24, 20, 35, 36, 46, 50, 63, 67, 00, 02, 93, 100, 112, 120, 121, 129, 130, 144, 163, 165, 166, 167, 175, 192, 199, 202, 206, 220, 230, 240. ## 2. Non-astronomical but suggestive of other explanations 4. Balloons or ordinary aircraft: 95, 11, 22, 41, 42, 43, 54, 73, 81, 83, 91, 92, 113, 114, 115, 126, 131, 136, 141, 145, 156, 156, 157, 160, 160, 161, 168, 169, 171, 173, 178, 180, 182, 185, 190, 194, 195, 196, 198, 200, 201, 209, 210, 217, 222, 236, 237, 239. b. Rockets, flares or falling bodies 4, 6, 6, 7, 8, 9, 12, 13, 14, 15, 16, 25, 54, 65, 70, 106, 107, 100, 109, 133, 170, 211, 218. 4. Miscellaneous (reflections, auroral streamers, birds, etc.): 759, 89, 123, 124, 128, 146, 164, 181, 189, 214, 221, 231, 234. ## 3. Non-astronomical, with no explanation evident a. Lack of evidence precludes explanation 55, 44, 45, 47, 66, 67, 72, 86, 67, 88, 90, 99, 110, 117, 118, 126, 127, 137, 159, 149, 160, 177, 179, 191, 200, 212, 213, 229, 232, 233. b. Evidence offered suggests no explanation: f1, 2, 10, 17, 21, 29, 37, 40, 51, 62, 60, 41, 42, 64, 60, 71, 75, 76, 77, 79, 84, 105, 111, 122, 136, 151, 162, 164, 162, 165, 172, 176, 183, 186, 196, 207, 216, 223, 224, 226, 227, 236, 241, 242, 243, 244, 134.
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.