The Type 1 Ho-Ki was an unarmed armored personnel carrier used by the Imperial Japanese Army in World War II. It was set to appear in Call of Duty: World at War but was cut sometime during the development stages.
Call of Duty: World at War
All that remains are texture sheets and two model files: One undestroyed, and one destroyed.
The name of the complete model is vehicle_jap_tracked_type1ho-ki_mp The suffix MP seems to suggest that the vehicle was going to be used in multiplayer.