On this day in '61 communication between Strategic Air Command (SAC) HQ and three ballistic missile early warning sites goes silent. Considering this a possible sign of enemy attack, all SAC bases in the United States are alerted, and B-52 bombers await orders for takeoff. It is later determined that all communications between SAC and these sites ran through one relay station in Colorado, where the lines went down after a motor overheated.
http://the60sat50.blogspot.com/2011/...sac-norad.html
http://the60sat50.blogspot.com/2011/...sac-norad.html

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