Bigger and badder. An out-gowth of the KV-1 design, the JS series tanks were also developed as tank destroyers and assault guns. The big daddy of them all was the ISU-152 with a 152mm Gun and the nickname “animal killer”. Based on the Js Chassis, the vehicle was used in dual purpose anti-tank and anti-Bunker missions and tended to operate behind the Assault waves of JS-2 series tanks. Production continued till 1947 and this vehicle served various militaries into the 1970’s.