Named after the Soviet defense commissar Kliment Voroshilov, testing of the KV along with 3 multi-turreted tanks the T-35, T-100, and the SMK began in September 1939. These tanks were soon battlefield tested during the "Winter War" from December the same year. Battlefield experience revealed the SMK and T-100's poor mobility, while the KV's good performance led to its adoption as the Soviet Army's next generation heavy tank. During WWII, the KV-1 heavy tank proved to be a difficult customer to handle for the invading German Army and forced them to build stronger and heavier tanks. Includes DMD Control Unit T-03 for running and Multi Function Unit MF-01 for sound, flash and recoil actions. Gearbox, speaker unit, flash unit and optical fibres are also included. Turret rotates and gun elevates. Features include engine sound, gun/hull recoil, forward and reverse, independent suspension, die cast drive cogs, and rotating turret.