One of the major problems faced by the Japanese military during WW2 was the challenge of transporting heavy equipment, like tanks, from island to island. A potential solution was found in the form of flying, or rather gliding, tanks. These light tanks featured detachable wings, empennage (stabilizing surfaces at the tail-end of an aircraft), and take-off carriages. But because the tracks of the tank would never survive a landing, a pair of detachable skis were attached to the machine. Once detached from an aircraft, like the Mitsubishi Ki-21 “Sally” heavy bomber, it would coast to the destination like a glider, land, and assume responsibilities as an armoured ground vehicle.
The Japanese managed to produce some prototypes of these flying tanks, including the Maeda Ku-6 and the Special No. 3 Flying Tank, or Ku-Ro.