I think you can make a successful game in just about any setting. If you make the gameplay well enough I don't see why a Vietnam era game can't succeed, as controversial as it might be. Although I certainly wouldn't call it a "revolution" just a different style of MUD.
The problem I see is what are your players going to do? To me, a "realistic" day in the life of a vietnam soldier conjurs up images of eating food from a can and trying to fight off jungle rot on my foot. And no "cure fungus" spell to be found...
The point of such spells in games is to give the players superhuman abilities. There a very few games I can think of that don't give the player some sort of superhuman power. Whether it's creating fireballs out of thin air or the ability to be shot 20 times and still live. I think without this, you will have to be extremely creative in your gameplay.
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