I believe if you volunteer, you have more input into where you're assigned, and if you have a valuable non-front-line talent that would factor in as well. So if

I believe if you volunteer, you have more input into where you're assigned, and if you have a valuable non-front-line talent that would factor in as well. So if you can't find some way to avoid it entirely, then I think volunteering before you're drafted would serve best.