Where is it?
It would be cool if during a battle the dust, smoke, and debre from the fighting started to affect visibility. The more bombs that blow up, the more tanks move around, the more airplanes that go down in flames the worse the fog of war would get. Now for all you pessimistic folks I am not talking a zero visibility environment, just a little smoke and dust to spice it up. I would be cool to see smoke rolling off a town and dust clouds from incoming tanks.