In 1954, of land adjacent to the Mad River at the northeast boundary of the base, near the former location of the village of Osborn, were purchased for a Strategic Air Command dispersal site. Area D structures were demolished in 1957 (donated to the state in 1963 for Wright State University). In February 1958 the Wright Field (Area B) runways were closed to all jet traffic (1959 Area C operations included 139,276 takeoffs and landings, Area B had 44,699.) The West Ramp complex was built between August 1958 and July 1960. The 4043rd Strategic Wing began KC-135 Stratotanker operations in February 1960 and B-52 Stratofortress operations in June 1960. On 1 July 1963, the wing was re-designated the 17th Bombardment Wing (Heavy) and continued its mission under this unit until 7 July 1975, when the last of its 11 B-52s was transferred to Beale Air Force Base, California. From 1957–1962, WADC's Hurricane Supersonic Research Site in Utah was a detached installation of Wright-Patt.