When I first played Halo 2 I saw the marines and said, "man, I wish I could play as those guys." And then my cousin told me they sucked so I shut up. But really, wouldn't it be cool to play as like a squad of marines with new weapons and stuff? Like, not as one charcter, but when you died you'd just play as the guy next to you, so you could go through like 5 marines to take down a single elite, but the player would still take it down.