just incase it hasnt been brought up (im 2 lazy to search).
tough game, great graphics, very realistic, free, created by the US Army.
if you live in the US, u should get it for the simple fact that US tax dollars
pay for it's development. Current windows version is 2.0, Linux is 1.9 with a 2.0
patch comming soon. I've been up all night playing it. If you have Gentoo, a simple emerge americas-army will grab it and install it but it's a HUGE download (over 500 Meg).
P.S. If u really intend to play, please read teh website 1st. The game tries to emulate the army as best as possible, which mean before you can play u have to go through basic training. It's not that hard (the game is multiplayer only)