DEC 16 1966, JAN 3 1967; North American Air Defense Command; Huge blast doors at Norad's underground
DEC 16 1966, JAN 3 1967; North American Air Defense Command; Huge blast doors at Norad's underground combat operations center.; These 30-ton blast doors, set 50 feet apart, would close in 30 seconds in the event of an impending air attack against Cheyenne mountain complex.; (Photo By The Denver Post via Getty Images)
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Credit:
Editorial #:
162375149
Collection:
Denver Post
Date created:
December 16, 1966
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Source:
Denver Post
Object name:
DPL0892813