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.
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About Sunset on 3 Aug 1948, about 25 kilometers (20miles) northwest of Moscow an experienced American newspaper reporter saw an unidentified object at very high altitude. It was long and narrow and proceeded at a high but not excessive speed in a generally south-west-northeast direction. It shone very brightly probably from reflected sunlight. No wings could be seen and no sound was heard. It looked like a rigid airship and was so identified by a Russian acquaintance who saw it at the same time. However, the reporter, in spite of the appearance of the object was of the opinion that it was not a rigid airship due principally to its high speed. He had no theory to offer. NA COMMENT: This object might have been anything. Its speed seems insufficient for a guided missile, but it could have been either a jet or a conventional airplane as unusual light conditions and fore-shortening frequently give aircraft a freakish appearance. The possibility that it was a dirigible should not be excluded. Reference "A" should not be excluded. REFERENCE A: The upper winds in Russia are not published but it was noted that on the following morning there were high surface winds with storm predictions.
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 GLM-OCR; expect the odd misread word. 178 pages are in the text index: search them above, or from the library's search.