Willmar Air Force Station (ADC ID: SM-139) is a closed

United States Air Force The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part ...

General Surveillance Radar station. It is located northwest of

Willmar, Minnesota Willmar is a city in, and the county seat of, Kandiyohi County, Minnesota, United States. The population was 21,015 at the 2020 census. History Agricultural expansion and the establishment of Willmar as a division point on the Great Northern ...

. It was closed in 1961.

History

Willmar 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 station became operational on 1 July 1956 when the 721st Aircraft Control and Warning Squadron was moved to the station by the

31st Air Division The 31st Air Division (31st AD) is an inactive United States Air Force organization. Its last assignment was with Air Defense Command, assigned to Tenth Air Force, being stationed at Sioux City Municipal Airport, Iowa. It was inactivated on 31 ...

. This site became operational in 1957 with the 721st AC&W Squadron operating a variety of radars including

AN/FPS-6 The AN/FPS-6 Radar was a long-range height finding radar used by the United States Air Force's Air Defense Command. The AN/FPS-6 radar was introduced into service in the late 1950s and served as the principal height-finder radar for the United Stat ...

, AN/FPS-8, AN/MPS-7, and AN/FPS-3 sets, and 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. During 1959 Willmar AFS joined the

Semi Automatic Ground Environment The Semi-Automatic Ground Environment (SAGE) was a system of large computers and associated networking equipment that coordinated data from many radar sites and processed it to produce a single unified image of the airspace over a wide area. SA ...

(SAGE) system, initially feeding data to DC-11 at

Grand Forks AFB Grand Forks Air Force Base (AFB) is a United States Air Force installation in northeastern North Dakota, located north of Emerado and west of Grand Forks. The host unit is the 319th Reconnaissance Wing (319 RW) assigned to the Air Combat Co ...

, North Dakota. After joining, the squadron was re-designated as the 721st Radar Squadron (SAGE) on 15 January 1960. 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. The station closed on 1 June 1961 due to budgetary constraints. Today the former Willmar Air Force Station is now Willmar Technical College. Mostly rebuilt, some USAF buildings remain.

Air Force units and assignments

Units: * 721st Aircraft Control and Warning Squadron, Assigned on 1 July 1956 :: Activated at 31st AD,

Snelling AFS Fort Snelling is a former military fortification and National Historic Landmark in the U.S. state of Minnesota on the bluffs overlooking the confluence of the Minnesota and Mississippi Rivers. The military site was initially named Fort Saint Anth ...

, Minnesota on 8 April 1956 (not manned or equipped) : Re-designated 721st Radar Squadron (SAGE), 15 January 1960 : Discontinued on 1 June 1961 Assignments: *

, 1 July 1956 *

29th Air Division The 29th Air Division (29th AD) is an inactive United States Air Force organization. Its last assignment was with Air Defense Command, being stationed at Duluth International Airport, Minnesota. It was inactivated on 15 November 1969. History ...

, 1 January 1959 *

Grand Forks Air Defense Sector The Grand Forks Air Defense Sector (GFADS) is an inactive United States Air Force organization. Its last assignment was with the Air Defense Command 29th Air Division, being stationed at Grand Forks Air Force Base, North Dakota. It was inactiv ...

, 1 April 1959 – 1 June 1961

References

* 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 Willmar AFS, MN
{{Aerospace Defense Command, state=collapsed Installations of the United States Air Force in Minnesota Semi-Automatic Ground Environment sites Aerospace Defense Command military installations 1956 establishments in Minnesota Military installations established in 1956 1961 disestablishments in Minnesota Military installations closed in 1961

History

Air Force units and assignments

See also

References