Normally I'd say Vietcong, but Vietnam War is also fucking amazing in a sort of a McDickie way where there's a lot of systems you don't know if they're supposed to be clashing, are clashing because of errors or are not intended to be at all. Somehow delivers on the whole "horrors of war" aspect despite the "minimalistic" style: you can drop actual hundreds of tons of bombs on an enemy position just to be sure if you got 'em.