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North against South Vietnamese.
The US wasn't fighting the Vietnamese. The US was fighting the communist NORTH Vietnamese. The SOUTH Viets were friends of the US.
North Vietnamese communists
The North was fighting the US; the South was allied to the US.
Correct.
The North Vietnamese governments guerrilla fighters and regular army.
the north vietnamese (a.k.a. the viet cong or VC)
The United States where fighting the North Vietnamese Army to deter communism in South Vietnam. The Chinese also were a part of the conflict however not so much as a direct entity as a funding source for the NVA.
The NVA and the VC (North Vietnamese Army and the Viet Cong).
The United States lost the will to continue fighting. The Vietnamese, who were defending their own country, were willing to fight forever. The North Vietnamese saw no distinction between North and South Vietnam. Ed Vietnam War Veteran 1968-69
The same enemy everybody else was fighting: the North Vietnamese Army (NVA) and the Viet Cong (VC).
The NVA and ARVN fought in South Vietnam. The only fighting taking place in North Vietnam was between jet aircraft (the air war).