I suggest United Opperations as someone else posted here. Good on the realism. nice bunch of guys. some great mission makers. always running different and varied missions. Id also reccomend U.S.SOCOM really hardcore realism. Great bunch of people. depends how much realism you want. socom is a bit much for some. Id suggest UO as a starter for most though. they also made the ACRE radio mod which is basically essential for this game. I would no longer play witout it and anyone who uses it will say the same!