Empire Air Force Station is a former United States Air Force Aerospace Defense Command (ADC) long range radar site located 0.7 miles (1.1 km) south-southeast of Empire, Michigan, in Empire Township. It was closed in 1978 by the Air Force, and turned over to the Federal Aviation Administration (FAA).
The Southwest Air Defense Sector (SWADS) is an inactive United States Air Force organization. Its last assignment was with the First Air Force, being stationed at March Air Force Base, California. It was inactivated on 31 December 1994.
The 685th Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Oklahoma City Air Defense Sector, Aerospace Defense Command, stationed at Las Cruces Air Force Station, New Mexico. It was inactivated on 1 August 1963.
Antigo Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 7.5 miles (12.1 km) south-southwest of Antigo, Wisconsin. It was closed in 1977 and is currently classified as a high risk toxic waste site involving groundwater, sediment, soil and surface water.
Calumet Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 5.2 miles (8.4 km) east-southeast of Phoenix, Michigan. It was closed in 1988 by the Air Force, and turned over to the Federal Aviation Administration (FAA).
The 645th Radar Squadron is an inactive United States Air Force unit. It was last assigned to the 20th Air Division, Aerospace Defense Command, stationed at Patrick Air Force Base, Florida. It was inactivated on 1 April 1976.
The 653d Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Oklahoma City Air Defense Sector, Air Defense Command, stationed at England Air Force Base, Louisiana. It was inactivated on 1 August 1963.
Custer Air Force Station is a closed United States Air Force General Surveillance Radar and Direction Center station. It is located 5.3 miles (8.5 km) west-northwest of Battle Creek, Michigan. It was closed in 1969.
The 661st Radar Squadron is an inactive United States Air Force unit. It was last assigned to the 23d Air Division, Aerospace Defense Command, stationed at Selfridge Air Force Base, Michigan. It was inactivated on 1 July 1974.
Grand Marais Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 0.5 miles (0.80 km) south of Grand Marais, Michigan. It was closed in 1957.
Condon Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 5.7 miles (9.2 km) west of Condon, Oregon. It was closed in 1970.
Mica Peak Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 6.3 miles (10.1 km) east-northeast of Mica, Washington. It was closed in 1975 by the Air Force, and turned over to the Federal Aviation Administration (FAA).
The 637th Radar Squadron is an inactive United States Air Force unit. It was last assigned to the 25th Air Division, Aerospace Defense Command, stationed at Othello Air Force Station, Washington.
The 914th Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Duluth Air Defense Sector, Air Defense Command, stationed at Armstrong Air Station, Ontario, Canada. It was inactivated on 1 November 1962.
The 639th Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Sault Sainte Marie Air Defense Sector, Air Defense Command, stationed at Lowther Air Station, Ontario, Canada. It was inactivated on 1 July 1963.
The 912th Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Sault Sainte Marie Air Defense Sector, Air Defense Command, stationed at Ramore Air Station, Ontario, Canada. It was inactivated on 1 January 1962.
The 915th Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Duluth Air Defense Sector, Air Defense Command, stationed at Sioux Lookout Air Station, Ontario, Canada. It was inactivated on 1 October 1962.
The 918th Aircraft Control and Warning Squadron is an inactive United States Air Force unit. It was last assigned to the Seattle Air Defense Sector, Air Defense Command, stationed at Baldy Hughes Air Station, British Columbia, Canada. It was inactivated on 1 March 1963.
