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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.
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SMS in October. 145 ( ) These EMP tests by SAMSO and Boeing are to discover the weak spots in the different types of Minuteman configurations along the EMP field. When weak or faulty areas are found, ECPs are initiated to correct these discrepancies. 146 On 28 September 1967, Sierra 39, 564th SMS, was deposited and turned over to Boeing for EMP tests. These tests will be conducted until about mid-January 1968. The primary reason for Boeing's EMP testing is to determine the effectiveness of the lightning protection equipment of the Real Property Installed Equipment (RPIE) at 564th SMS's LFs. Various voltages will be inserted into the site equipment from a test tie-in to simulate the effects of lightning strikes on the outside cable communications, ground electronics system and associated LF equipment. 147 Later, on 22 October, SAMSO joined Boeing on these EMP tests at Sierra 39. (U) A primary cause always associated with Echo Flight Incident has been connected with some type of adverse power affect. Tests have been conducted time and time again to determine this, but have always lead to a negative result. Boeing's testing at
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