Battlezone Rocks! Download it FREE! (Score 1)

Someone mentioned Battlezone here and I have to second their opinion. It is a great tank FPS perspective action game plus it has a RTS component where you can build bases, manufacture different offensive and defensive units, play for hours against all comers etc. Or you can just jump into a quick game with nice folks. I have met people from Norway, England, Georgia (usa), France, South America and some jerks from Australia too! All in all it is a great game. You can download it here

Good luck finding a good game. America's Army takes too long to get into IMO.