[4] Construction began at an upper location[need quotation to verify] of the former World War II Mount Tamalpais Radar Site of the Aircraft Warning Service[5] (the World War II information center of the AWC was located at tbd for plotting radar tracks in the San Francisco area).

Mount Tamalpais Air Force Station was the military installation where the 666th Aircraft Control and Warning Squadron was activated on January 1, 1951.

[9][3] The Air Defense Command Manual Control Center at the station networked ground-controlled interception radars,[10] and on March 10, 1952, the first Multiple Corridor System for identification of traffic arriving from overseas became operational outside San Francisco.

Mill Valley Air Force Station' received an AN/FPS-8 in 1955 (subsequently converted to an AN/GPS-3), and during 1956 an AN/FPS-4 height-finder radar operated (superseded by an AN/FPS-6 in 1958.)

[12] During SAGE deployment, a Burroughs AN/FST-2 Coordinate Data Transmitting Set (CDTS) was installed at Mill Valley AFS and "in late 1960" began providing digitize radar tracks for telecommunication via microwave to the Air Defense Direction Center (DC-18) at Beale Air Force Base (the squadron was re-designated 666th Radar Squadron (SAGE) on 15 January 1961.)

With the inactivation of the San Francisco Air Defense Sector at Beale in 1963,[specify] Mill Valley CDTS data was transmitted to Adair AFS, Oregon (DC-13).