 However, Strategic Air Command (SAC) was concerned that bases with large concentrations of the new jet bombers made attractive targets.SAC's response was to break up its B-52 wings and scatter their aircraft 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.At the same time, the reduced number of interceptors available to Air Defense Command (ADC) due to attrition and closing production lines made ADC bases along the northern tier of states available for expansion to accommodate SAC heavy bombers and tankers.