The Cheyenne Mountain Complex (CMOC) is a non-public military installation of the United States Department of Defense located inside Cheyenne Mountain, in El Paso County, Colorado. It is the training complex for crew qualification, and is an alternate command center for the North American Aerospace Defense Command (NORAD), and United States Northern Command (USNORTHCOM). The installation was established in February 1967 as a bunker and operations center, and was designed to be partially resistant to attack by nuclear-tipped missiles. Built and owned by the Department of Defense, it also has Royal Canadian Air Force personnel serving there.