B-57E Canberra dedicated Air Defense Command target towing aircraft were used for training of F-86D Sabre, F-94C Starfire, and F-89D Scorpion interceptors firing 2.75-inch Mk 4/Mk 40 Folding-Fin Aerial Rockets. Due to the nature of air-to-air weapon training requiring a large amount of air space, only a few locations were available for practice ranges. ADC assigned these aircraft to bases close to these large, restricted areas, and fighter-interceptor squadrons deployed to these bases for this type of "hot fire" training which took place in these ranges.