Documents / FOIA release
This Department of Defense Intelligence Information Report, released by the Central Intelligence Agency, is dated 19 December 1968 and was filed from Vientiane, Laos. It quotes a 7/13AF intelligence message on low, slow radar returns near Nakhon Phanom RTAFB in Thailand. Helicopter checks of those returns found nothing. The message attributes such returns to balloons, birds, kites, temperature inversions and unreported Thai flights, and says there is no evidence of hostile activity. The report also notes an unidentified aircraft seen over Ban Thatong, Laos.
Read from the scan by GLM-OCR; expect the odd misread word.
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FOIA release, from the cia-readingroom 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. 4 pages are in the text index: search them above, or from the library's search.