The 307th ARS was first activated in June 1950 and attached to the 307th Bombardment Wing at MacDill Air Force Base, Florida. The unit, however, was located at Davis-Monthan AFB, Arizona for flying. The 307th gained its crews and equipment from the inactivated 2d Air Refueling Squadron (which later started up again at Hunter AFB, Georgia). 307th crews flew the KB-29M Superfortress, a British grappling hose-type refueling aircraft. On 1 Aug 1951, the people and equipment inactivated and stayed at Davis-Monthan to form the 9th Air Refueling Squadron.