sentences:  The group was inactivated on 4 August 1946 and its personnel, mission, and equipment were reassigned to the 28th Bombardment Group.The origins of the 449th Bombardment Wing began on 1 July 1959 when SAC established the 4239th Strategic Wing (SW) at Kincheloe AFB, Michigan, an Air Defense Command (ADC) base, whose host was the 507th Fighter Group (Air Defense ) and assigned it to the 40th Air Division as part of SAC's plan to disperse its Boeing B-52 Stratofortress heavy bombers over a larger number of bases, thus making it more difficult for the Soviet Union to knock out the entire fleet with a surprise first strike.The wing remained a headquarters only until 1 June 1961 when the 70th Munitions Maintenance Squadron was activated to oversee the wing's special weapons.