Operation Flashpoint: Cold War Crisis

Operation Flashpoint is not your average shoot em up game. It is a one of its kind soldier simulator - which is the reason USMC (and others as well) use a modified version as squad leader training. The game OFP itself is excellent, hands down. However, by adding all the mods and extras made by the community, it is possible you might look at a brand new game. The core game is set in the 80's between the USSR and the US, but I have played as a WW2 German soldier and a modern day Somalian militia to just mention a few. The only thing which is a let down is the graphics but even that can be fixed with the aforementioned mods. Add to that the really easy to use mission editor and you have a package that will last a very long time.