March 1947 at Hensley Field, Texas, with the 740th Squadron, which was already active, assigned to it. At Hensley its training was supervised by ADC's 4122d AAF Base Unit (later the 2596th Air Force Reserve Training Center). The 741st and 742d Squadrons were activated to join the group in late June and early September 1947, respectively. In October, the group was rounded out with the activation of the 743d Squadron, which was not stationed with the group, but at Sheppard-Kell Municipal Airport. The 455th was nominally a very heavy bomber unit, but does not appear to have been fully manned or equipped while a reserve unit. In 1948 Continental Air Command (ConAC) assumed responsibility for managing reserve and Air National Guard units from ADC. President Truman's reduced 1949 defense budget required reductions in the number of units in the Air Force. ConAC also reorganized its reserve units under the wing base organization system in June 1949. As a result, the group was inactivated and its personnel and equipment at Hensley Field were transferred to elements of the 443d Troop Carrier Wing, which was activated simultaneously. The 743d Squadron was also inactivated and reserve flying operations at Sheppard came to an end. Tactical Air Command The group was redesignated the 455th Fighter-Day Group and activated at Myrtle Beach Air Force Base, South Carolina in July 1956 as Tactical Air Command planned to organize a second North American F-100 Super Sabre wing there. Some personnel were assigned to the group and its squadrons, but it never became operational with aircraft. It was inactivated in July 1957 and its few personnel were reassigned to elements of the 354th Fighter-Day Wing. Intercontinental ballistic missile wing The wing's second predecessor was organized at Minot Air Force Base, North Dakota in November 1962 as the 455th Strategic Missile Wing along with its 740th Squadron. The 741st and 742d Squadrons were organized in December 1962 and January 1963. The wing prepared for operational capability with LGM-30B Minuteman I missiles through March 1964. The wing's first Minuteman missile arrived on 6 September 1963, and was placed three days later. The 150th, and final, missile was placed on 26 February 1964, and by late March the wing became combat-ready. On 25 June 1968, the 455th was inactivated and transferred its assets to the 91st Strategic Missile Wing, which moved to Minot on paper from Glasgow Air Force Base, Montana.