Do you know this game ? It's a free game and the best game i ever play online http://www.americasarmy.com . There is more than 5'000'000 players on this game! :
"America’s Army is one of the five most popular PC action games played online. It provides players with the most authentic military experience available, from exploring the development of Soldiers in individual and collective training to their deployment in simulated missions in the War on Terror."
TRY IT