Kit #AA2035. 1/72 scale. Highly-detailed resin kit with decals. In early 1946, the USAAF issued a requirement for a new attack bomber to succeed the Douglas A-26 Invader. Martin Company proposed a design and won the competition with designation XA-45. The USAAF then revised its requirement to include better close-support bombing. Martin accepted the new requirement and was awarded a contract for two prototypes, and the project was redesignated XB-51. The XB-51 made its first flight on October 1949. It became the fastest ground support bomber at the time. In 1950, with the outbreak of the Korean War, the USAF expressed the need for a new night intruder bomber. The XB-51 competed against the English Electric Canberra. The XB-51 was faster but its endurance was poorer than the Canberra. After a fly-off in 1951, the Canberra was chosen as the winner. The XB-51 project was cancelled in 1952. Although Martin lost the order for the XB-51, it received a license to produce the Canberra under the designation B-57.