The Type 98 20 mm AA Half-Track Vehicle was an experimental Japanese self-propelled anti-aircraft gun. It was a single 20mm, type 2 gun mounted on a type 98, 4-ton half-track. The vehicle, which was also named the "Ko-Hi", was manufactured by Isuzu. The Type 98 4-tonners were "high speed" prime movers, capable of 25 mph when loaded. Average transport time was 10 hours road time for 125 miles.