Documents / Report
This National Security Agency release, Part E of a series of Communications Intelligence (COMINT) reports, is undated and heavily redacted. It contains classified message traffic marked Secret Spoke and Top Secret Umbra. The messages record radar tracking of unidentified flying objects, often several at a time, at altitudes from about 500 to 88,500 feet. Most entries describe the objects as probably balloons. Locations, sources and many dates have been removed.
Read from the scan by GLM-OCR; expect the odd misread word.
5. RADAR TRACKING OF UNIDENTIFIED FLYING OBJECTS (UFQ): 0804-0834, SEVEN UFO (PROBABLY BALLOONS) MOVED OVER ALT 11,500-16,000 FT. XXHH #0008 NNN
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Report, from the nsa 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. 25 pages are in the text index: search them above, or from the library's search.