Journey inside the top-secret headquarters of NORADโthe North American Aerospace Defense Commandโa binational military command composed of the United States and Canada. Established in 1958 during the height of the Cold War, NORADโS initial mission was air defense against a bomber attack by the Soviet Union. We see how its primary mission has changed through the years, and go inside the Cheyenne Mountain Operations Center, one of historyโs most ambitious underground building projects.