A master chief body with a crewman head. Simple, no?
I need the crewman face permutations on it, plus a Johnson if you find the time.
No helmets, please, but if you do Johnson, do please include the hat.
P.S. I know the Johnson is a separate model, so only do that if you have some free time.

I've done Johnson, well, the Halo 2 Johnson + Hat, on the Halo 1 cyborg biped. But that was awhile ago and I dropped it. I like the idea, but using Halo 2 heads might yield better results, albeit it takes longer.