The Japanese forces had two airborne formations. The army units were known to be called Tesin Dan and their equivalent in the Navy were known as Rikusentai. Their weakness was the lack of heavy equipment. There was no assault howitzers or plots recoilless like their German and American counterparts. Therefore, at the end of 1943, the staff cited a research project to prepare a light tank transported on their own air wings. The tank was named Sora-Sha (soaring vehicle) had a double crew, the driver was also a pilot, the weight to 2900 kg and detachable wings. In the air had to be towed by a heavy bomber Mitsubishi Ki-67 Hiryu. The prototype was completed in January 1945, but the light tank had already failed to meet the requirements of the battlefield.