Glasgow Air Force Base (GAFB, former ICAO: KGSG; 1957–1968, 1971–1976) is a former United States Air Force base located approximately 17 miles (27 km) north of the city of Glasgow, Valley County, Montana, not far from the Canadian border. Prior to DoD ownership, 605 acres (245 ha) of this land were used as a municipal airport and the rest for agricultural purposes.