Editing Beale Air Force Base (section)

===Air Defense Command===
[[File:San Francisco Air Defense Sector.jpg|thumb|125px|left|Emblem of the [[San Francisco Air Defense Sector]]]]

In 1959 [[Air Defense Command]] (ADC) established a [[Semi Automatic Ground Environment]] (SAGE) Data Center (DC-18) was established at Beale AFB. {{Coord|39|06|35|N|121|23|49|W|display=inline|name=Beale SAGE}} The SAGE system was a network linking Air Force (and later FAA) General Surveillance Radar stations into a centralized center for Air Defense, intended to provide early warning and response for a Soviet nuclear attack. The Ground Air Transmitting Receiving (GATR) Site (R-18) for communications was located at {{Coord|39|05|45|N|121|24|19|W|display=inline|name=Beale GATR}}, approximately 1.1 miles south-southwest from the SAGE building. Normally the GATR site was connected by a pair of buried telephone cables, with a backup connection of dual telephone cables overhead.

DC-18 was initially under the [[San Francisco Air Defense Sector]] (SFADS), established on 15 February 1959. DC-18 and the SFADS was inactivated on 1 August 1963 as part of an ADC consolidation and reorganization, with its assigned units assigned to other ADC Sectors. The GATR was reassigned to [[Mill Valley AFS]] (Z-38) as an annex designated OL-A, [[666th Radar Squadron]]. Today the large SAGE building is now building 2145, housing the 9th Reconnaissance Technical Squadron; the GATR was inactivated in 1980 and the building is now part of a Skeet-shooting range.