The United States Air Force organized its first air refueling squadrons in 1948. In 1955, Strategic Air Command (SAC) organized the first wing to command air refueling units at Dow Air Force Base, Maine. Since then, air refueling wings have been organized by Tactical Air Command (TAC), Military Airlift Command (MAC), United States Air Forces in Europe (USAFE) and Air Mobility Command (AMC). Additional wings have been organized in the Air National Guard (ANG) and the Air Reserves (AFRES).