This close-up captures the tail and flying boom of a Boeing KC-135 Stratotanker, the jet-powered aerial refueling aircraft that replaced the piston-engine KC-97 beginning in the late 1950s. In the background, an older propeller transport remains parked on the same ramp, illustrating the U.S. Air Force's gradual transition from propeller to jet aircraft during the early Cold War. Project: 218468