keeping armor to a minimum, no more than one inch thick and roofless, open-top turrets (a standard design feature for all American fully tracked tank destroyers of World War II) and by powering the relatively small vehicle with a radial engine originally designed for aircraft usage. M36 Jackson/GMC Together with the M10 and M18, the 90 mm gun-armed M36 Gun Motor Carriage, provided American and Allied forces with a respectable mobile anti-tank capability against the newer German armored types. The M36 combined the hull of the M10 tank destroyer, which used the M4 Sherman's reliable chassis and drivetrain combined with sloped armor, and a new turret mounting the 90 mm gun M3. Conceived in 1943, the M36 first served in combat in Europe in October 1944, where it partially replaced the M10 tank destroyer. It also saw use in the Korean War, where it was able to defeat any of the Soviet tanks used in that conflict. Some were supplied to South Korea as part of the Military Assistance Program and served for years, as did re-engined examples found in Yugoslavia, which operated into the 1990s. Two remained in service with the Republic of China Army at least until 2001. The vehicle is also known under the unofficial nickname Jackson, but this designation appears to be a postwar invention that was never used by the US Army. Howitzer Motor Carriage M8 The Howitzer Motor Carriage M8 aka the "Scott" was a self-propelled howitzer used for close support. It saw use on the western and Italian fronts, as well as in the Pacific. The turret had a 75mm howitzer and was mounted on an M5 Stuart hull. It also had an M2 Browning machine gun. It went 36 mph on roads, had 9.5–44 mm of armor, and had a crew of four. It was very effective against bunkers and other stationary enemy positions. It later saw use in the First Indochina War and the Algerian War. Some self-propelled artillery and self-propelled mortar vehicles were used in the direct fire role, but the M8 and the 105 mm howitzer-armed Sherman "Jumbo" were the only vehicles dedicated for the use. Korean War and Cold War Light tanks M24 Chaffee The M24 Chaffee was intended to replace the aging and obsolete Light Tank M5 (Stuart), which was used in supplementary roles. Crews liked the improved off-road performance and reliability, but were most appreciative of