The M1 Abrams is a US battle tank which, according to Wikipedia, was used in battle in the ’90 Gulf war and the ’03 Iraq war. The Abrams Battle Tank game is from 1988. Because no prior battles had been fought with the tank, public enemy number 1 at the time was picked: the Soviets. You’ll fight a series of fictional battles against a (quoting the manual) “large mediocre force” of Soviet tanks. I think I can see some Cold War propaganda seeping through in this game.