<Li> Cheyenne Mountain Complex </Li> <Li> NORAD Cheyenne Mountain Complex (January 20, 1965) </Li> <P> The Cheyenne Mountain Complex is a military installation and nuclear bunker located in Colorado Springs, Colorado at the Cheyenne Mountain Air Force Station, which hosts the activities of several tenant units . Also located in Colorado Springs is Peterson Air Force Base, where the North American Aerospace Defense Command (NORAD) and United States Northern Command (USNORTHCOM) headquarters are located . </P> <P> Formerly the center for the United States Space Command and NORAD, the Complex monitored the air space of Canada and the United States through a worldwide system for missiles, space systems, and foreign aircraft through its early - warning system . Since 2008, NORAD and the United States Space Command have been based at Peterson Air Force Base and the complex, re-designated as an air force station, is used for flight crew training and as a back - up command center if required . </P>

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