The Leopard 2 is a main battle tank of German production. It is built since 1979 and is the successor of the Leopard 1. The version A6 equipped with it's longer main gun is since 2001 in service at the German Army. The Leopard 2 tank was originally intended as the backbone of the armored forces and to ward off enemy tank units.
Among the best tanks in terms of both reliability and sheer production capability, M4 Sherman series of tanks became the staple fighting-vehicles of the WWII Allies. The 1st version to be produced, was succeeded by the welded-hull M4, the diesel engine M4A2, and finally the representative tank of the series, the M4A3.