Documents / Official release
This U.S. Department of War file collects Project Sign era checklists and incident summary sheets for incidents 101 to 172. The largest item is the 18 February 1948 explosion over Norcatur, Kansas. For it the file gathers witness statements, speculative letters from Norman G. Markham, and Dr. Lincoln LaPaz's view that it was a genuine meteorite fall with curious aspects. Other entries cover B-29 crews, a two-decked wingless object over the Netherlands, a Turkish rocket report, a Moscow sighting, and George Gorman's 1 October 1948 Fargo encounter.
From the source:Release of 2026-05-08 Incident: N/A, N/A. NARA Record Group 38, catalogue id 143685. Each of these incident summaries includes a "Check-List - Unidentified Flying Objects" that contains details about the incident. Many summaries also include witness lists or statements and other narrative reports or descriptions.
“Gray”2 pages
Observer noticed what appeared to be a small black cloud between two white ones. Seemed peculiar because the weather was clear and there were a few white clouds in the sky - but no other dark clouds or formations of any kind. The black cloud did not have any definite shape but looked like an anti-aircraft shell a few seconds after it explodes. Suddenly it stretched out into a wide streak with smaller vertical streaks, then rapidly turned and twisted, moving into a different direction and disappearing. In three or four seconds, the smoke burst appeared again spontaneously, approximately 20° west of the place where first noticed. Smoke pattern dark, very large, and dispersed rapidly, appearing again as a wide streak a mile or so in length which appeared to twist from a wide to a narrow streak and then back again changing direction as it twisted. Moving in westerly direction against light wind. Plainly visible altho far away and very high. No sound heard. Seemed like a streak that would be made if a flying wing with several engines were banking and turning and leaving exhaust trails. Note: Yantis was in the war and had seen a lot of anti-aircraft shells burst and many vapor trails from planes but had never observed anything like this. He states: "It was so spontaneous like a rubber band which is round, then suddenly is stretched at length and twisted, and then disappears without a trace." Agent's Note: Yantis drew the sketches below Streak twisted and turned - suddenly disappeared 1st position width same - length estimated at 1 to 2 miles
Official release, from the pursue collection. The PDF is mirrored here; the original link is above. The text was read from the page images by an OCR model; expect the odd misread word. 178 pages are in the text index: search them above, or from the library's search.