The KM-2B was a further development of the Fuji KM-2 (itself a four-seat development of the T-34 Mentor with a more powerful engine) for use as a primary trainer for the Japan Air Self-Defense Force (JASDF).
The KM-2B is an upgraded version of the Fuji KM-2, which was itself based on the T-34 Mentor and featured a more powerful engine. It was developed specifically to serve as a primary trainer for the Japan Air Self-Defense Force (JASDF).