Mount Lemmon Air Force Station was established in 1954 by Air Defense Command as one of a planned deployment of forty-four mobile radar stations to support the permanent ADC Radar network in the United States sited around the perimeter of the country. This deployment was projected to be operational by mid-1952. Funding, constant site changes, construction, and equipment delivery delayed deployment. In addition to the main facility, Mount Lemmon operated several AN/FPS-14 Gap Filler sites: * Sells, AZ (M-92A): * Benson, AZ (M-92C): * Globe, AZ (M-92D):