Boeing KC-97L Stratofreighter
Aerial refueling boom operators position in the Boeing KC-97L Stratofreighter on display in the Cold War Gallery of the National Museum of the U.S. Air Force. A cargo version of the B-29, The C-97 Stratofreighter first flew in 1944. Boeing introduced the tanker version KC-97 with the flying boom refueling system in 1950. (U.S. Air Force photo by Ty Greenlees)