M4A3E9 Sherman

When the Sherman Tank was initially created, it was designed around US theory about how medium tanks, and full-track armored vehicles in general, should be utilized on the battlefield. In US doctrine, the medium tank's job was to assist infantry in the assault and provide a base of fire to fight from. Taking on enemy tanks were the job of purpose-built tank destroyers. The UK, which was a major user of the Sherman, differed in doctrine - tanks were expected to engage enemy tanks.