machine guns for tanks have been discussed, and vetoed. They'd make tanks unstoppable death machines. Grenades might be cool, but a soldier could only carry so many in real life, and they couldn't be too powerful. I think that they were used mainly to clear large groups of infantry, which, with an average of 4 enemies, there's rarely going to be many walking soldiers. of course, there's always one time in a game where everyone takes a tank and then I kill all of them, but I'm not sure if grenades would really be useful. There's never enough enemies in one spot.