The M103 Heavy Tank (officially designated 120mm Gun Combat Tank M103, initially T43) was a heavy tank that served in the United States Army and the United States Marine Corps during the Cold War.

USA (and ROC) Uses the Gun Combat Tank 103 120mm as the heavy tank model.

It was one of the heaviest Allied tanks of the war.

The Tank, Infantry, Mk IV (A22) Churchill was a British infantry tank used in the Second World War, best known for its heavy armour, large longitudinal chassis with all-around tracks with multiple bogies, its ability to climb steep slopes, and its use as the basis of many specialist vehicles.UK and Commonwealth ( Canada, India, Australia) uses the Infantry Tank MK IV (A22) 'Winston Churchill' as the heavy tank model. After August 1944, production of the Tiger I was phased out in favour of the Tiger II. 1,347 were built between August 1942 and August 1944. It gave the German Army its first armoured fighting vehicle that mounted the 8.8 cm KwK 36 gun (derived from the 8.8 cm Flak 36). The Tiger I was a German heavy tank of World War II that operated beginning in 1942 in Africa and in the Soviet Union, usually in independent heavy tank battalions.Germany, Romania, Bulgaria, Hungary, and Finland uses the Panzerkampfwagen VI Ausf H 'Tiger I' as its heavy tank model. Air-Defense - takes reduced damage from Air Raids

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