Why is the military moving back into 'Stargate' base deep under the Rocky Mountains a decade after it was abandoned?

The Cheyenne Mountain Complex is one of the icons of the Cold War - a self-contained and sufficient town buried under the Rockies meant to be impervious to a Soviet nuclear barrage.

It was home to the North American Aerospace Command (NORAD), scanning the skies for Russian missiles and the military command and control center of the United States in the event of World War Three.

The high tech base entered popular culture with appearances in the 1983 Cold War thriller War Games and 1994's Stargate - which imagined the complex as a clandestine home for intergalactic travel.

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