sentences:  The organization was reactivated as part of Air Defense Command (ADC) in 1957 as the 73d Air Division.As part of ADC, it evaluated, upgraded, and determined the proficiency of the Air Defense Command fighter-interceptor and missile squadrons, 1 July 1957 – 1 April 1966.The division developed and tested Air Defense Command tactics, equipment, aircraft, guided missiles, and related equipment and armaments.