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Walnut Ridge Air Force Station Part of Air Defense Command (ADC) Type Air Force Station Coordinates 36°07′48″N 090°55′09″W / 36.13°N 90.91917°W / 36.13; -90.91917 (Walnut Ridge AFS SM-143) Built 1956 In use 1956-1963 Controlled by  United States Air Force Garrison 725th Aircraft Control and Warning (later Radar) Squadron Walnut Ridge AFS Location of Walnut Ridge AFS, Arkansas Emblem of the 725th Radar Squadron Walnut Ridge Air Force Station (ADC ID: SM-143) is a closed United States Air Force General Surveillance Radar station. It is located 4.7 miles (7.6 km) north-northeast of Walnut Ridge, Arkansas. It was closed in 1963. Contents 1 History 2 Air Force units and assignments 3 See also 4 References 5 External links History Walnut Ridge 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 United States Air Force Air Defense Command established a Mobile Radar site at Walnut Ridge Regional Airport in 1956, designating it Walnut Ridge Air Force Station, and designating it as SM-143. The 725th Aircraft Control and Warning Squadron was assigned to Walnut Ridge AFS from Tinker AFB, OK on 1 July and began operating an AN/MPS-11 radar set at the station. Initially the station functioned as a Ground-Control Intercept (GCI) and warning station. As a GCI station, the squadron's role was to guide interceptor aircraft toward unidentified intruders picked up on the unit's radar scopes. In 1958 an AN/FPS-6 replaced the AN/FPS-4 height-finder radar that had been installed a year earlier, and a second AN/FPS-6 was added subsequently. During 1962 Walnut Ridge AFS joined the Semi Automatic Ground Environment (SAGE) system, feeding data to DC-07 at Truax Field, Wisconson After joining, the squadron was re-designated as the 725th Radar Squadron (SAGE) on 1 May 1962. The radar squadron provided information 24/7 the SAGE Direction Center where it was analyzed to determine range, direction altitude speed and whether or not aircraft were friendly or hostile. In March 1963 the Air Force ordered this site to close. Operations ceased on 1 August 1963 and the 725th Radar Squadron was inactivated. With its closure, Walnut Ridge was determined to be excess by the military and turned over to the local government for civil use. Today, the Air Force radar site is part of the civil airport, and the Williams Baptist College. Most of the USAF buildings are still in use, some by the college and some by Southwest Airlines, which has established a training facility at the site. Air Force units and assignments Units: 725th Aircraft Control and Warning Squadron, activated at Tinker AFB, Oklahoma, 8 April 1955 Moved to Walnut Ridge AFS, 1 July 1956 Re-designated 725th Radar Squadron (SAGE), 1 May 1962 Discontinued, 1 August 1963 Assignments: 33d Air Division, 8 April 1955 20th Air Division, 1 March 1956 Kansas City Air Defense Sector, 1 January 1960 Chicago Air Defense Sector, 1 July 1961-1 August 1963 See also List of USAF Aerospace Defense Command General Surveillance Radar Stations References [1] [2] [3] ^  This article incorporates public domain material from websites or documents of the Air Force Historical Research Agency. ^ Shaw, Frederick J. (2004), Locating Air Force Base Sites History’s Legacy, Air Force History and Museums Program, United States Air Force, Washington DC, 2004. ^ Shettle, M. L., Jr. (2001). United States Marine Corps Air Stations of World War II. Bowersville, Georgia: Schaertel Publishing Co.. ISBN 0-964-33882-3.  A Handbook of Aerospace Defense Organization 1946 - 1980, by Lloyd H. Cornett and Mildred W. Johnson, Office of History, Aerospace Defense Center, Peterson Air Force Base, Colorado Winkler, David F. (1997), Searching the skies: the legacy of the United States Cold War defense radar program. Prepared for United States Air Force Headquarters Air Combat Command. Information for Walnut Ridge AFS, AR External links v · d · e Aerospace Defense Command (ADC) Bases CONUS Adair · Beale · Bong (unbuilt) · Charleston · Davis-Monthan · Dobbins · Dover · Dow · Duluth · England · Ent · Ethan Allen · Fairfax · Fort Lee · Geiger · George · Glasgow · Grand Forks · Grenier · Griffiss · Gunter · Hamilton · Hancock · Homestead · Hurlburt · Imeson · K.I. 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