Las Vegas Air Force Station was initially part of Phase II of the Air Defense Command Mobile Radar program. The Air Force approved this expansion of the Mobile Radar program on October 23, 1952. Radars in this network were designated “SM.” The radar site is located on top of Angel Peak, which is north-northwest of the city of Las Vegas, and east of Mt. Charleston. In addition to the main facility, Las Vegas operated several AN/FPS-14 Gap Filler sites: * Boulder City, NV (SM-163A): * Lathrop Wells, NV (SM-163B):