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.
Secret: The Cheyenne Mountain Complex in Colorado was built for NORAD to direct the American response to a nuclear war with the USSR during the Cold War
Protection: There are 15 three story building inside the military complex and each is buffered by a 25-ton blast door
It shut down nearly ten years ago as the threat from Russia seemed to subside, but this week the Pentagon announced that Cheyenne Mountain will once again be home to the most advanced tracking and communications equipment in the United States military.
The shift to the Cheyenne Mountain base in Colorado is designed to safeguard the command's sensitive sensors and servers from a potential electromagnetic pulse (EMP) attack, military officers said.
The Pentagon last week announced a $700 million contract with Raytheon Corporation to oversee the work for North American Aerospace Command (NORAD) and US Northern Command.Admiral William Gortney, head of NORAD and Northern Command, said that 'because of the very nature of the way that Cheyenne Mountain's built, it's EMP-hardened.'
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