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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.
“Seattle”11 pages
Sierra 39 is just another test to assure that the Wing VI 1148 configuration will not be affected by adverse electrical effects. (U) A conference was held at Whiteman AFB, Kan., to review test data for a Force Mod EMP modification. The members of the conference agreed that the data indicated the proposed modification would be effective. A decision was made that additional testing would be required by Boeing to verify that specific frequencies were safe in Force Mod systems. These tests were completed in August 1967. Three major changes have resulted from EMP testing. Boeing has submitted ECPs, numbers 1221, 1141-1 and 1141-2, for the modification of EMP for Force Mod. Another change was a Facility Change Initiation Request (FCIR) Maintenance Change Letter (MCL) number 2827, not yet incorporated into the Force Mod systems. (U) Presented next will be the changes to the EMP for Force Mod. Because of the complicated engineering terminology, a detailed explanation given by the Boeing Engineers will not be presented of the changes to the EMP. Changes will be presented in brief explanation given by the ECP. (U) Boeing ECP 1221 will modify the interconnecting box by adding a major sub-assembly containing zener diodes, isolation
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