First To Fight
Here is a game that has some potential and is released for the pc this week. It is the U.S. Marines version of American Army yet unlike its counterpart is not free and will apparently focus on the close quarters combat aspect of the United States Marine Corps warfare in the streets and buildings of Beirut.
http://www.firsttofight.com/html/index.html
http://www.firsttofight.com/html/index.html