The wing's mission expanded in July 1948 when it received the 509th Air Refueling Squadron and its KB-29M hose-type tankers and later with B/KB–29P boom–type tankers. Although aerial refueling had been accomplished as far back as the 1920s, the Air Force decided to make it a permanent part of its operations. In fact, the 509th AREFS was one of the first two AREFSs ever activated. In the first week of December 1948, the squadron began receiving the KB-29M, modified B-29 bombers capable of providing air-to-air refueling for bombers using a refueling hose today's USAF standard flying boom. With the addition of tankers, the 509th's bombers could reach nearly any point on earth. In June 1950, the wing received the B-50D Superfortress and in January 1954, the KC-97 Stratotanker replaced the aging KB-29Ms.