 On 8 January 1966, Military Air Transport Service became Military Airlift Command (MAC) and the units were redesignated as the 109th Military Airlift Group and 139th was redesignated as the 137th Military Airlift Squadron.With the retirement of the C-97 in 1971, the 109th became a Tactical Airlift Group and the 139th Tactical Airlift Squadron received eight C-130A Hercules transports and was transferred from MAC to Tactical Air Command.The first major mission of the C-130s was in June 1972 when the squadron provided relief assistance to storm victims of Tropical Storm Agnes.