Well, I have prevailed upon my semi regular RPG group to play a Halo campaign of an undecided game system. Since I wanted to play so badly, they have all decided that I get to GM. Swell.
I admit to being a terrible GM. I want this game to be successful enough that it can be a semi regular thing that runs long enough that someone else is willing to GM so I can actually play.
I am pretty sure I want to make the PCs members of the Spartan III program, which has the most room for variability between characters, and still lets the PCs be Spartans. That seems to be what everyone wants to play at this point anyway.
So, what game system should I use, and does anyone have some primo advice to help make this the best campaign ever? Right now I am leaning towards d20 modern (and the Future expansion, of course, since I actually have it), though I'm open to suggestion at this point. I had actually thought about using Deathwatch, since power armored Space Marines and Spartans have more than a little in common, but I don't feel like renaming every ability, and the feel would just be wrong otherwise.