3rd Air Division was activated on 18 June in its place. Its objective was to control all SAC units in the Far East. The division operated as a tenant unit from June 1954 until April 1955 and received host-base support services from the 6319th until that unit was inactivated on 1 April 1955. The 6319th was replaced with the SAC-aligned 3960th Air Base Wing. SAC continued its 90-day unit rotational training program and began to take control of the base from the FEAF. After the 1 April 1955 base transfer and activation of the 3960th Air Base Wing, B-47s replaced the B-36s in the rotations. The 43rd Bomb Wing from Davis-Monthan Air Force Base, Arizona, operated from July to October 1957, which eventually became Andersen's host unit. The 3960th Air Base Wing was redesignated on 1 July 1956 as the 3960th Air Base Group. The 41st Fighter-Interceptor Squadron of the Pacific Air Forces, along with its F-86s, was stationed at Andersen from August 1956 until it was inactivated in March 1960. After that, the air defense mission was provided by deployments of Fifth and Thirteenth Air Force units flying the F-102 aircraft. Vietnam Andersen's rotational duties concluded when the B-47 was phased out and replaced by the B-52 Stratofortress. The first B-52, the "City of El Paso," arrived from the 95th Bomb Wing at Biggs Air Force Base, Texas in March 1964. It was followed by KC-135 Stratotankers. With the start of Operation Arc Light in June 1965, B-52Fs and KC-135As began regular bombing missions over Vietnam and continued until 1973, with a break between August 1970 and early 1972. In support of Operation Arc Light, SAC activated the 4133rd Bombardment Wing (Provisional) on 1 February 1966. The 3960th Strategic Wing, which was originally activated in 1955 as the 3960th Air Base Wing, continued as the base's host wing until it was inactivated and replaced by the 43rd Strategic Wing on 1 April 1970. The 43rd assumed the mission of the 4133rd on 1 July 1970. It continued in this capacity until the 57th Air Division (Provisional) and 72nd Strategic Wing (Provisional) were activated in June 1972 in support of Operation Bullet Shot (military operation name for temporary duty assignment of US-based technicians — "the herd shot 'round the world."). The 303rd Consolidated Aircraft Maintenance Wing (Provisional) was activated in July 1972. All of the provisional units remained at Andersen