There are a lot of war scenes in science fiction, but most of them emphasize the pew-pew-pew and spaceship CGI over realistic representations of combat. Are there any futuristic movies that actually show us the grim reality of what war might be like in years to come?

My pick is the tight action flick Edge of Tomorrow, whose timey-wimey premise may not be very realistic, but whose insane battle scenes and mecha armor feel like the trappings of a plausible future war. What would be your pick? Give us your reason, along with video, pictures, or links!