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This Black Vault release contains the Air Force's 2001 response from the 341st Space Wing FOIA office at Malmstrom AFB, Montana, to a request about the 16 March 1967 Echo Flight missile shutdown, with excerpts from 341st Strategic Missile Wing histories covering 1967 to early 1968. The histories say all ten Echo Flight launch facilities lost strategic alert almost simultaneously. Investigators could not find a logical cause and found rumors of UFOs near Echo Flight to be unfounded.
“Headquarters”14 pages
Read from the scan by GLM-OCR; expect the odd misread word.
(EMP) testing conducted by SAMSC, the Boeing Company and the 341st SMW at site Sierra-39 of the 564th SMS. The original tests were terminated on 9 January, and the site was returned to the Wing. Due to a G&C change, the site did not resume alert posture until 14 January. 86
(U) Two Time Compliance Technical Orders (T.C.T.O.) came from the EMP testing. One was for the addition of EMP pulse suppression to LF interconnecting boxes to eliminate the effect of noise generated by electrical discharge type pulses in the Hardened Intersite Cables. The second was the addition of VRSA monitor line protection relays to the interconnecting boxes to prevent equipment damage and/or failure from overvoltages below 2000 volts. The two T.C.T.O.s were to accomplished concurrently. The second of the T.C.T.O.s was not released until 27 March, and work was not started by the end of the quarter. $ ^{89} $
(U) A Summer-66 EMP program was scheduled to begin 1 April at site India-6 of the 12th SKS. However, due to contractual problems associated with the test program, the date for the start of the program slipped to 1 June 1968. The program was to last for one year. 90 Document, cited by the archive. 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. 88 pages are in the text index: search them above, or from the library's search.