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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
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Logic Drawer interface STC. This caused the system to shut down with a Channel 9 & 12 No-Go. 135 (U) Boeing studied the source and path of the noise Pulse to the Logic Coupler and suspected that the Sensitive Information Network (SIN) lines would cause the noise Pulse. Further studies at Malmstron AFB by Boeing proved this analysis wrong. 136 (U) Tests at Boeing's Network Resolution Area (NRA) have proven that the C-53P Logic Coupler is the receiver of the noise Pulse irregularities. These tests had 60 percent of the time, the responses were the same as experienced at Echo Flight, and 85 percent of the time placing the system in a non EWO status. (U) OOAMA thought that the cause of the incident was of the Electro Magnetic Pulse (EMP) noise or electrostatic nature. OOAMA, also thought that the problem was a Wing I peculiar problem; because Channel 9 & 12 No-Go shut downs have never been reported at Wing II thru V. This fact was due to the significant difference between the Logic Couplers, inter site cabling, and LF cabling of the Minuteman I and Minuteman II systems. 138 (U) CONE conducted tests at the Hill Experimental Test Facility (HETF) on the Wing II-V Logic Coupler to determine if it could
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