Documents / Report
This National Security Agency release, Part F of a series of Communications Intelligence (COMINT) reports, collects heavily redacted intercept messages with no stated date. Most entries record radar tracking of unidentified flying objects by altitude, speed, heading and time, often in groups, and most are marked as probably or believed to be balloons, inferred from appearance and altitude. One message describes a large white semicircular object seen for about ten minutes before it moved west.
“West”7 pages
CATEGORY = 405 MESSAGE = 02659746 IX0 #0911 2840932 ZNY MMCRN ZKZK RR DE
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Report, from the nsa 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. 25 pages are in the text index: search them above, or from the library's search.