Mountain Home Air Force Base (IATA: MUO, ICAO: KMUO, FAA LID: MUO) is a United States Air Force installation located in southwestern Idaho, United States. The base is in Elmore County, 12 mi (19 km) southwest of the city of Mountain Home, which is 40 mi (64 km) southeast of Boise, via Interstate 84. The host unit at Mountain Home since 1972 has been the 366th Fighter Wing (366 FW) of the Air Combat Command (ACC), nicknamed the "Gunfighters." The base's primary mission is to provide combat airpower and combat support capabilities to respond to and sustain worldwide contingency operations.