in the summer of 1961, a complete reorganization of mccoy began as a program commenced to convert the base from b-47 stratojet and kc-97 stratotanker operations to boeing b-52 stratofortress heavy bombers and boeing kc-135 stratotankers. the 321st wing began phasing out its operations in june 1961 and was inactivated in october 1961. its operations at mccoy were temporarily assumed by the 4047th strategic wing until replaced by the 306th bombardment wing when the latter organization relocated from macdill air force base, florida in 1963.