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.
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The US was representing the free world in it's fight against communist aggression.
The North Vietnamese Army (North Vietnamese Air Force over N. Vietnam) and the Viet Cong.
Plenty of US Servicemen of Irish descent fought in the war, but Ireland did not fight in the Vietnam War.
Like the US Civil War in the 1860s the Vietnam War in the 1960s divided America.
The US was large enough and industrialized enough, to sustain a normal society, and fight a war at the same time.
The US supported Ho Chi Minh fight the Japanese in Vietnam as part of their war with Japan .
Australia mirrored US actions.