This is what PennyArcade has to say about American Army. "I won't waste time talking about the visuals... just trust me when I say that they're really out of this world. Telling you that they're using the UT2K3 engine should (hopefully) settle the argument. Also, it should go without saying that things like the weapons, movement, sounds, and locations are highly accurate, probably because the developers got their advice from the FUCKING ARMY (just wait until you get flashbanged... I guarantee you will find the experience that ensues to be highly unsettling). They've included both radio commands and hand signals, which is critical because the enemy can actually hear you when you talk. Night vision behaves like real fucking night vision... lights become these blinding coronas, and you can see two little green dots moving around in the darkness. Look... I could go on for hours about how great this game is, but even then I'm sure it wouldn't do the game any justice..."