By the mid-1960s, the B-58 had become a fairly effective weapons system. By the end of 1962, USAF crews had made over 10,500 flights and loges 53,00 hours (1150 of them supersonic, including 375 at Mach 2). Initially, all B-58 training was conducted by the 43rd's combat-crew training school. From 1960 through 1964, this unit fulfilled the requirements of both its parent 43rd Bomb Wing and the second B-58 wing, the 305th Bomb Wing. In August 1964, the 305th activated its own CCTS. The wing also controlled an air-refueling squadron from August 1964.