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Easily one of the best heavy tank designs the U.S. Army came up with, sadly the T-29 never saw action as it was introduced too late in the war. However, the tank served as an excellent test platform for new automotive components, and because it functionally resembled Soviet heavy tanks, the T-29 effectively served as one of the prototypes for American Cold War-Era tanks.
Ordering the small variant will give you a single tank. Ordering the medium variant will give you two tanks. Ordering the large variant will give you five tanks.