Also did lovely stuff with the South Vietnam politics, US player could interfere in elections, generate coups. Game success was based on pacifying population, both sides had different objectives and means of fighting. Great stuff. (Very complicated, caused several brain melts just reading rules the first time).
Always struck me that this would have been an excellent game to convert to a PC game, but unfortunately it is such a niche within a niche, it's never happened. Yes there is a vassal version (been tempted; but where's the time); anyways getting back on topic DC Barbarossa gives me hope that such a program will one day be available.