I've said it before and I'll say it again (since you asked). It would be a realistic war game, I'm not talking about CODMW type "realistic" where you kinda team with fellow soldiers. I mean, like a mix between the emotions, drama, and other great things from "The Hurt Locker" and the realistic actions in "Black Hawk Down". I would also like if they could have properly functioning voice recognition that would make me feel like I'm am actually in a real conversation with the NPC, granted, it would be (realistically) kinda driven by them and limited in responses but I'm sure you get the idea. Also, have real military MOS involved such as Medic, Sapper, etc. For example, while playing as a Medic, you would have to perform basic first aid while under the simulated stress of fire. (The Sapper is basically an engineer that also acts as Infantry for those of you who don't know.) This would be taught to you through a tutorial designed after the real life AITs, I'm not saying teach enough to make people dangerous or anything but a basic working knowledge I guess (except for the obvious ones which would be switched out with...I don't know, "hacking" puzzles like Bioshock? Haven't really thought those other ones out yet). For the Sapper, that would basically be just strategies (i.e. blowing a manhole cover through a wall. I've heard a story about that happening, just imagine what it must've been like in that room.) The Medic player would be taught a very basic understanding that could (in theory) translate in to a real life scenario, thus saving someone's life, and getting good publicity for gaming. Also, the squad tactics would be more realistic. You couldn't just wander off and still survive. Oh, and EOD would be basically just the stuff from "Hurt Locker". Throw in moral curveballs like a disoriented (likely blinded) patient fighting you off, a guy with a cell phone who can't understand you (yeah, it's a "Hurt Locker" ripoff but that's a tough decision none the less). Oh, and little bits of lightness and humor to liven things up like talking with fellow soldiers, the romance story with your girl back home, and finding out that cell phone had "One Missed Call". Sometimes luck just happens that way.