On display at the National Museum of the U.S. Air Force. The C-97 Stratofreighter was the modified cargo/transport version of the B-29. Of the 890 aircraft ordered by USAF, 816 were KC-97 tankers with a tail boom, and the L-model was fitted with two J47 turbojet engines on underwing pylons. This aircraft was flown by 160th Air Refueling Group (ARG) of the Ohio ANG and was christened "Zeppelinheim" by the mayor of that German town during Op. Creek Party, the aerial refueling of NATO forces in Europe.