I've never been one to buy fully on the FAC thing for assault pilots, except as a bargaining chip to get some other deal from the monitor, or if you really dig wearing cammies. Make your first B-billet as an IP at the FRS, Flt School, or (if you can) MAWTS-1. Then go back to the fleet, or if you are of the proper mindset, do your V-22 transition. Don't let yourself get snagged for any jobs near the flagpole (anything with an "HQ" in the title) until you're a major!!!
Under most conditions, if you're a solid performer, you won't get tagged for involuntary servitude as FAC, MWSS, Group, unless you ask for them. Being a coffee boy captain at wing or group HQ isn't going to help you any. As a major, your staff jobs can have pretty high impact. Certain staff jobs can even get you joint credit, which is important as you progress.
My point being, you do have to pay the man eventually. Don't pay him more, or earlier, than you have to. I'm on track to fly through year 14 of commissioned service, and I've got a decent career progression. Keep an eye on what types of billets are out there on the monitor's webpage, even if you're not moving that year. Caveats: 1) TBS lts and SNAs--don't bother yet, concentrate on what's important--learning to fly. 2) Don't actually start pestering your monitor until the year before you're supposed to move. Give yourself a long-term plan that fits your personal and professional goals and have a couple of fallback positions. Don't bet the farm on the exchange tour with the Canadian Snowbirds (BTW, I made that up, so no questions about it, please).