Documents / Official release
This U.S. Department of War file, undated, holds checklist summaries of incidents 1 to 100 of unidentified flying objects reported in 1947 and early 1948. The first entries cover sightings of silver discs and spheres by officers and staff at Muroc Army Air Field on 7 and 8 July 1947. Next come the Portland, Oregon police reports of 4 July, a United Air Lines crew near Emmett, Idaho, and a set of 30 December flame and explosion reports from California and Nevada. The file ends with two Finnish sightings.
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.
“Nevers”5 pages
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On 28 June 47 XXI 1488XEXT in a P-51 bound for Portland, Oregon, by way of Medford, Oregon, at approx 1515 CST (course of 300 $ ^{\circ} $ ) and ground speed of 285 MPH, altitude 10,000 ft, approximately 30 miles NW of Lake Meade, Nevada. It Armstrong sighted 5 or 6 white, circular objects at 4:00, position altitude approximately 6,000 ft, on a course of 120 $ ^{\circ} $ and flying at an estimated speed of 285 MPH. The objects were flying very smoothly and in a close formation. The estimated size of the white objects was approximately 36 $ ^{\circ} $ in diameter. It Armstrong was sure the white objects were not birds since the rate of closure was very fast. He was certain too that the white objects were not jets or conventional aircraft since he has flown both.
AGENT'S NOTES:
Lt Armstrong was very sincere in the explanation and was not the exagerating type. He merely stated what he saw and drew no conclusions. Official release, from the pursue 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. 209 pages are in the text index: search them above, or from the library's search.