McPeak's later tenure as chief of staff following the Gulf War also saw a major reduction in force in terms of aircraft, units, officers and enlisted airmen across the entire Air Force as a result of the end of the Cold War. During his time as chief of staff, he oversaw the disestablishment of Strategic Air Command (SAC), Tactical Air Command (TAC), Military Airlift Command (MAC), Air Force Systems Command (AFSC), Air Force Logistics Command (AFLC), and Air Force Communications Command (AFCC), with assets transferred primarily to the newly established Air Combat Command (ACC), Air Mobility Command (AMC), Air Force Materiel Command (AFMC) and the then-Air Force Communications Agency. His tenure also oversaw the merging of Air Training Command (ATC) and Air University (AU) into the Air Education and Training Command (AETC).