The North American Aerospace Defense Command is a United States and Canada bi-national organization charged with the missions of aerospace warning and aerospace control for North America. Aerospace warning includes the detection, validation, and warning of attack against North America whether by aircraft, missiles, or space vehicles, through mutual support arrangements with other commands. The Cheyenne Mountain Complex is located at Cheyenne Mountain Air Force Station, a short distance from NORAD and USNORTHCOM headquarters at Peterson Air Force Base in Colorado Springs. Cheyenne Mountain Air Force Station falls under Air Force Space Command and hosts the activities of several tenant units.