Kit #AA2068. 1/72 scale. Highly-detailed resin kit with decals. In 1939, the USAAF issued requirement for a new medium bomber which could operate at high-altitude to avoid attack from ground fire. Martin and North American responded with the requirement. Martin submitted the Model 182, which was redesigned from the B-26 Marauder; North American proposed NA-63 which was based from the B-25 Mitchell. In 1940, North American's design was chosen and the company was awarded a contract for two prototypes that designated XB-28. The first prototype made its first flight on April 1942, demonstrating an excellent design, with significantly better performance than the B-25. However, the USAAF changed the requirement and rejected the XB-28 project because high-altitude bombing was too susceptible to errors caused by wind, cloud cover. The second prototype was completed as the XB-28A reconnaissance version. At the same time, most medium bombing during the war was done successfully from low altitudes, and it was decided not to interrupt Mitchell production for an untested type, and the XB-28 project was cancelled.