Casus Belli is a realistic multiplayer mod for Crysis Wars. It takes place in a not so distant future in the context of a third world war. You embody a soldier in many different surroundings, from the Afghan deserts to Ukrainian cities. The gameplay is battlefield-like, offering many brand new features. Casus Belli is developed by a non-profit association.

http://www.casusbelli-mod.com/main/?page_id=141

Very nice.