Use to play it, gave it up cause of another online game but yes its worth it I became quite addicted to the bunker raid mission where you get paracute in. I was thinking the other day of reinstalling AA. I only have AA v2.7 so its probably a big update for me too.
edit.
No need to register & wait in cue from this site:
America's Army: Special Forces (Overmatch) v2.8.3 Full
Ausgamers
http://www.ausgamers.com/files/details/html/33420