sentences:  The 449th continued the mission of strategic bombardment training and contributing to SAC's worldwide refueling capability.It supported SAC combat operations in Southeast Asia by furnishing KC-135 aircraft and crews from November 1965 through December 1975 and B-52 crews between May 1968 and June 1975.Although the number of ADC interceptor squadrons remained almost constant in the early 1960s, attrition (and the fact that production lines closed in 1961) caused a gradual drop in the number of planes assigned to fighter interceptor squadrons, from 24 to typically 18 by 1964 and to 12 by 1967.