Article: Inside Cheyenne Mountain.

THE 25-ton steel blast doors of the world's largest command-and-control center--Cheyenne Mountain Operations Center--closed after the warning siren sounded. This time the doors closed as part of a monthly drill. On Sept. 11, 2001, those same doors closed indefinitely as a result of threats against the United States.

What began in 1956 as an idea for a "hardened" command and control center to defend against Soviet bombers became a reality in 1961 as construction began on a center capable of sustaining a thermonuclear blast.

From its original mission to protect the United States from Soviet manned bombers in the 1950s to playing a critical role in ...

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