United States, 1944 (184MB download, please be patient!)
The M4A3E2 (2nd experimental modification of the third modification of the fourth model of medium tank) was a heavy breakthrough tank made by the US Army. This modified Sherman equipped extra plating to its hull front and sides as well as the turret front and sides. This armor plating made it frontally immune to 88mm rounds. It needed these upgrades as it was designed to go through bunkers and defensive lines, where heavy fire was common.
Strangely, it did not mount the upgraded 76mm cannon as built (which was not the same gun as on the M5, but a lighter model with the same ammo) but instead mounted the earlier 75 mm gun (which had similar performance to the M3 GMC). However, several tanks were modified in the field to mount the 76mm.