The innovative T-34, a secret Russian tank project that dismayed the Germans and bolstered the allied forces on the Eastern front.
The Russian KV tank had advanced artillery and top-of-the-line armor and was a marvel when it was made in 1939.
Americans pulled out all the stops to build more than 6,000 Grant M3 tanks, with 75mm weapons, in less than 15 months.
Nearly 50,000 Sherman tanks were built during the war; it was unmatched for reliability, serviceability and cost effectiveness.
The quick, agile Cromwell tank underwent some design modifications before it saw action at Normandy in 1944.
The Allies strive to master the design, development and use of tanks during WWII.