The Vietnam War was a long, costly and divisive conflict that pitted the communist government of North Vietnam against South Vietnam and its principal ally, the United States. This war sparked important developments for the US forces. With no modern warfare rules, they were forced to use the supplies and technologies they had to battle against the dangerous Viet Cong. Coming together with the limited South Vietnamese soldiers, they employed different strategies and a new system of weaponry in order to fight effectively in a jungle warfare environment.