@7 I wonder if you would like the game foxhole. While its not necessarily realistic by any means, it simulates war in an interesting way.

Theres two armys fighting. The players themselves fight like any other game but other players need to mine, process, and manufacture all of the guns, ammo, vehicles, and even uniforms if I remember correctly.

It was interesting, less realistic combat wise but realistic in the fact that everything a soldier uses has real value towards winning the war.

The only issue was people took it very seriously.