The containment of communism.
North
The US has been fighting in Afghanistan longer it was fighting in Vietnam. It is the longest war in US history.
Vietnam, North and South Korea. Northern Africa
It was fighting for democracy and against communism.
During war, when fighting against recognized nations; POW=Prisoner of War. During the Vietnam War, US POWs wore striped prison uniforms.
The US wanted N. Vietnam to stop fighting in S. Vietnam.
The anti-communist countries fighting the communists in the war, were: The US, Australia, New Zealand, Philippines, Thailand, South Korea, and South Vietnam.
US Servicemen had been fighting communists in South Vietnam since 1955.
The US offered to help south Vietnam in 1961 to help Vietnam preserve its independence from the North. It was during the Cold War, and the US was fighting Communist Russia across the world.
US Secretary of Defense during the Vietnam War.
1. The US is not at war with Iraq. 2. The US was at war with North Vietnam.
Keeping up with communist new weapon technology (and they us), and fighting them in Korea and Vietnam.