American light and medium tanks had distinctively well balanced characteristics in WWII. The Americans rarely went too far in the armour department, reasoning that the mobility of a tank is one of its most important characteristics. However, the idea of building a tank with improved protection was not alien to them. One of these tanks was the specialized M4A3E2 tank, the best protected medium tank of WWII. Even though few were made, the M4A3E2 fought actively and proved itself to be an effective weapon.
A thicker front
The Medium Tank M4 was one of the best tanks in the world at the time of its creation. It had superior power to weight ratio to the Pz.Kpfw.III and Pz.Kpfw.IV produced in 1942, its sloped armour protected it from 50 mm guns at medium distances, and its powerful 75 mm M3 gun turned out to even be able to penetrate the Tiger from the side at a range of a few hundred meters. The tank had its drawbacks. The armour was not the greatest (Soviet experiments showed that it was worse than Soviet armour), and there were also complaints regarding the tank's excessive size and sights.