The Cheyenne Mountain Complex is a hardened military installation located inside Cheyenne Mountain in El Paso County, Colorado. It serves as an alternate command center for the North American Aerospace Defense Command (NORAD) and the United States Northern Command (USNORTHCOM). The facility is designed to withstand nuclear attacks and electromagnetic pulses, featuring massive blast doors and deep underground construction.
It functions as a training complex for crew qualification and maintains critical military communications and defense operations.