History
Mill Valley AFS was one of twenty-eight stations built as part of the second segment of the Air Defense Command permanent radar network. Prompted by the start of the Korean War, on July 11, 1950, the Secretary of the Air Force asked the Secretary of Defense for approval to expedite construction of the permanent network. Receiving the Defense Secretary’s approval on July 21, the Air Force directed the Corps of Engineers to proceed with construction.
The 666th Aircraft Control and Warning Squadron was activated at the new station, known as Mount Tamalpais AFS on 1 January 1951. The squadron began operating an AN/CPS-6B radar in late 1951. The station was re-designated as Mill Valley AFS, on 1 December 1953. In 1955 the site received an AN/FPS-8 that subsequently was converted to an AN/GPS-3. During 1956 an AN/FPS-4 height-finder radar operated. In 1958 the AN/FPS-4 was superseded by an AN/FPS-6 set. Mill Valley began operating an AN/FPS-7 search radar in 1960.
The Ground Air Transmitting Receiving (GATR) Site (R-18) for communications was located at 39°05′45″N 121°24′18″W / 39.09583°N 121.405°W / 39.09583; -121.405 (Beale/Mill Valley GATR), approximately 103 miles northeast from the main site at Beale AFB. Normally the GATR site was connected by a pair of buried telephone cables, with a backup connection of dual telephone cables overhead. The Coordinate Data Transmitting Set (CDTS) (AN/FST-2) at the main site converted each radar return into a digital word which was transmitted by the GATR via microwave to the Control Center. R-19 was part of the (SAGE) Data Center (DC-18) at Beale.
During 1961 Mill Valley AFS joined the Semi Automatic Ground Environment (SAGE) system, feeding data to DC-18. After joining, the squadron was re-designated as the 666th Radar Squadron (SAGE) on 15 January 1961. With the inactivation of the San Francisco Air Defense Sector at Beale in 1963, the station was switched to DC-13 at Adair AFS, Oregon. The R-18 GATR at Beale was taken over by the 666th RADS as OL-A.
By 1961 the 666th added AN/FPS-6 and AN/FPS-6B height-finder radars, and on 31 July 1963, the site was redesignated as NORAD ID Z-38. In addition, a detachment of the 666th began operating radars at Mather AFB after that site (P-58) was closed due to budget reductions in 1961.
In 1964 an AN/FPS-26A height-finder radar was added, replacing the AN/FPS-6. Also in 1964, the AN/FPS-6B was modified to an AN/FPS-90. In 1966 the AN/FPS-26A was removed from SAGE duties when it was converted to an AN/FSS-7 SLBM detection & warning radar, which was operated by the 3d Missile Warning Squadron and later as Detachment 3 14th Missile Warning Squadron on 8 July 1972.
In addition to the main facility, Mill Valley operated an AN/FPS-14 Gap Filler site:
- Fort Ord, CA (P-38A) 36°40′04″N 121°49′05″W / 36.66778°N 121.81806°W / 36.66778; -121.81806 (P-38A)
On 1 October 1979 Mill Valley came under Tactical Air Command (TAC) jurisdiction with the inactivation of Aerospace Defense Command and the creation of ADTAC, and the 666th Radar Squadron was inactivated on 30 September 1980.
During the 1980s, most of the property was turned over to the National Park Service and the FAA. The Air Force retained control of the height-finder radar (modified to an AN/FPS-116) and the SLBM radar, which was deactivated c. 1980. In 1995 the FAA operated an AN/FPS-66A search set. In the late 1990s, the AN/FPS-66A was replaced with an ARSR-4 in the old AN/FPS-26A / AN/FSS-7 tower, the only CONUS site to place an ARSR-4 in a tower other than a specially-designed ARSR-4 tower.
In 2005, the Federal Government's lease expired and the land was returned to the Marin Municipal Water District.
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