[Mustang]

MGs usually carry very heavy ammo loads, and do most of the killing. What we're talking about is regular infantry rifles (and especially SMGs), whose low ammo usually limited their utility in combat. MGs cause far more casualties than rifles, either automatic or semiautomatic, in real life, and provide the real firepower.

But basically what I'm saying is that although Western soldiers and soldiers with semiautomatic and single-shot rifles usually consume little ammo, I've seen a lot of instances in the game where an SMG unit or a unit that (in real life) has poor fire discipline (like the 3rd-world armies mentioned before) will keep firing for half an hour or more. Not that it has a decisive effect on gameplay, just food for thought.