 Postwar B-17s were used by the Military Air Transport Service Air Rescue Service, in 1948 being re-designated SB-17G.Some RB-17Gs were also used by the MATS Air Photographic and Charting Service (APCS).A few SB-17s were used by the Air Rescue Service in Japan during the Korean War (1950–1953), but all of the postwar B-17s were retired from MATS by the mid-1950s, becoming Air Proving Ground Command QB-17 Drones or DB-17 Drone directors.