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South Vietnam
The French were fighting in Vietnam in 1950 not the US.
The US wanted N. Vietnam to stop fighting in S. Vietnam.
US Servicemen had been fighting communists in South Vietnam since 1955.
It was fighting for democracy and against communism.
The US re-deployed from the place.
Basically, the Vietnamese sides, north and south, each had allies and supporters. These allies joined with the troops in Vietnam. The US was on the side of the south. They lost.
The containment of communism.
It was a noble cause.
Eisenhower's Testerones level
To prevent the spread of communism.
The US has been fighting in Afghanistan longer it was fighting in Vietnam. It is the longest war in US history.