I'd see it take on the realism of a CoD game with content like what Shellshock had. I want to be able to be a nice soldier or a cruel, cold killing soldier. I want to be able to steal from the gear of the Vietnamese, use it, sell it, whatever. Blow stuff up or use it one way or the other. Torture. The Punisher video game style torture.
Also, I would love it, for a nice scene for those of us who like the movie The Deer Hunter, to have a Russian Roulette mini game. If you get caught in the game, you get tortured, think of the torture scene in Metal Gear Solid, you press a button over and over or a sequence of buttons, and you make it out alive from a round of torture. Then, as it goes on, right before the torture level of the game ends you are forced into Russian Roulette. It all comes down to a 1-6 odds or a 4-6 odds. Your choice, however, it all goes according to the spin. No interference. Gives the player a sense of survival and death. Especially if you get your brains blown out and have to load up again.
Drug trafficking, human trafficking, prostitution, killing of the innocent and of the enemy.
Ah! How well my imagination gets the best of me when it comes to this kind of thing.