On 1 February 1978, the Air Force renamed the 305th Air Refueling Wing as the 305th Air Refueling Wing, Heavy. The Air Force activated the 931st Air Refueling Group at the base on 1 July 1978 as the second group of Air Force Reservists. The base also served as the home of one active duty wing and two reserve wings, using 60 KC-135 Stratotanker and 18 A-10 Thunderbolt II fighter aircraft. The 72d Air Refueling Squadron of the Air Force Reserve began operating its KC-135 Stratotanker aircraft from the Grissom in 1978.