It was found during the Vietnam War that there was a large duplication of aerial port facilities and mission objectives between MAC, TAC and PACAF. A study group recommended the consolidation of all tactical airlift forces under MAC as a cost-saving measure under MAC and on 1 December 1974 all TAC and TAC-gained AFRES and ANG C-130 tactical airlift wings, groups and squadrons were reassigned to MAC. In 1975, PACAF and USAFE tactical airlift wings were also reassigned to MAC, thus ending the theater troop carrier mission as it had existed since the beginning of World War II.