Air Force Special Forces units became part of TAC in 1961 when a counter-insurgency force was activated at Eglin AFB, Florida. Aircraft of these units consisted of a combination of propeller-driven World War II and Korean War-vintage fighters, modified trainers, Douglas B-26 Invader attack bombers and an eclectic collection of cargo and utility aircraft. Originally activated as a Combat Crew Training Squadron, the unit was upgraded to a wing and designated as the 1st Air Commando Wing. In 1964, TAC ordered a squadron of specially modified C-130E aircraft to support U.S. Army Special Forces and Central Intelligence Agency teams operating deep inside enemy territory. As the war in Vietnam intensified, additional air commando units were organized in Southeast Asia. In 1968, these units were redesignated as "Special Operations" squadrons.