Comparing: IS-3A vs. VK 45.02 (P) Ausf. A

In 1956–1957, the Military Armored Forces Academy developed a speculative design for a new loading system on the IS-3 and T-10 heavy tanks. The IS-3 variant featured a double-row ammo rack with an automatic loading system. The crew was reduced to three members: commander, gunner, and driver. The turret was redesigned in order to accommodate the loading mechanism. The vehicle existed only in blueprints.

Development of this vehicle started in April 1942. The Krupp company received an order for construction of turrets. However, the prototype was never manufactured. The turrets were mounted on the first Tiger IIs.