Notes: This a North Korean light tank, based on the chassis of the YW-531 armored personnel carrier. The North Koreans felt they needed a light tank even smaller than the Type 63, for use in the rough and mountainous terrain so prevalent in North Korea, and with greater amphibious capability. To this end, they fitted a modified YW-531 chassis with a turret similar to the PT-76, a more powerful engine, and propellers to drive the vehicle in the water. The result is a light vehicle with greater speed than the PT-76 or YW-531, able to pursue vehicles and maneuver on rough terrain. This vehicle is used only by North Korea. The goal of a vehicle lighter than the PT-76 was not achieved, however, as the M-1985 is quite a bit heavier than the PT-76, being based on a stretched YW-531 chassis with extra armor.