Ellsworth Air Force Base (AFB) (IATA: RCA, ICAO: KRCA, FAA LID: RCA) is a United States Air Force base located approximately 10 miles (16 km) northeast of Rapid City, South Dakota just north of Box Elder, South Dakota.The host unit at Ellsworth is the 28th Bomb Wing (28 BW) assigned to the Global Strike Command's Eighth Air Force. The 28 BW is one of only two B-1B Lancer strategic bomber wings in the United States Air Force, the other being the 7th Bomb Wing at Dyess AFB, Texas.