The Vietcong are the communists in the south and the nva are the communists in the north... The Vietcong were Guerrillias and the NVA was a real Army... I think thats enough to make them different sides
i have read many historic sources to make a summary of all sides, you can read it on our website...
http://www.thundermods.net/en/mods.php?id=1
and the US helped South-Vietnam because they were afraid of the domino effect...
also it was the cold war and this was the way, the soviet-union and the US fought their battles
