IS3

The IS-3, or Iosif Stalin-3, is a Soviet heavy tank developed toward the end of World War II and entering service after the conflict. It is best known for its distinctive wedge-shaped frontal hull and heavy, sloped armor designed to improve protection against contemporary anti-tank weapons. The tank mounts a 122 mm main gun and is supported by machine guns; the turret is cast, and the overall design emphasizes survivability and firepower for a vehicle in the heavy tank class.

Design and engineering focus on combining thick protection with mobility. The IS-3 employs a hull with sloped armor to enhance deflection and a robust suspension to maintain performance across varied terrain. It is powered by a diesel engine that provides adequate horsepower for a road speed in the tens of kilometers per hour range, suitable for its role as a breakthrough heavy tank on the battlefield.

Development aimed to address perceived shortcomings of earlier postwar designs by offering improved survivability and firepower. Production began in the late 1940s, and the IS-3 saw service with the Soviet Army and several allied states during the early Cold War period. It remained in reserve or limited frontline units into the 1960s. A modernization program produced the IS-3M variant in the 1960s, featuring upgraded armor and a revised turret.

Operators included the Soviet Union and various Warsaw Pact and other allied states. The IS-3 is cited as a representative example of early postwar Soviet heavy tank design, illustrating a focus on armor protection and durability alongside firepower in field conditions.