I hope that the weapon systems are fairly realistic. I doubt there will be any major imbalances as they seem to be taking some liberties with what the armies are using. Either way it wont matter I think, because in my experience with Arma 2 Public PvP everyone wants to join the US team to use M4's and Apaches whilst Russian team wins most rounds anyway :S. I always thought that said a lot about the players on each team :p.