A flight of three Avro Lancaster bombers of No. 617 Squadron, Royal Air Force, photographed 8 May 1945. The airplane closest to the camera, marked KC-B, is a Lancaster B Mk.I. The other two are Lancaster B Mk.I Specials modified to carry the 22,000 pound Grand Slam bomb. They are identified by the “YZ” fuselage codes. Photograph from the collection of Mrs. Cresswell, © IWM MH-30796.