Cheyenne Mountain Air Force Senior Airman Ricardo Collie, 721st Security Forces Squadron, patrols the north gate of the Cheyenne Mountain Complex, part of the North American Aerospace Defense Command, at Cheyenne Mountain Air Force Station, Colo., Jan. 7, 2016. SHARE IMAGE: Download Image: Full Size (0.92 MB) Tags: Air Force Photo By: Air Force Staff Sgt. Andrew Lee VIRIN: 160107-F-NL936-365C.JPG Photo Gallery