Been playing this for a bit and figured I'd offer my help.
I think I could work with you on "combat chatter" or perhaps as the voice of one of the guys sending e-mail to phalax commander (so cmd. navarre or the docter-in-chief or...) if you want those verbose as well. At the very least I'm "one more voice".
I'm Dutch, my spoken english is reasonable but I suppose not (completely) without accent. Shouldn't bother too much however, since PHALANX is quite the international bunch.
Let me know if your interested, if so -in what-, or that you would like to hear some sound samples first.
I've read that you want clear audio to start with, which is fine to me. I'm sure there are plenty of people here that are better to add effects then I am.
BuZZeM