To preserve the Republic from falling into the hands of the communists.
South Vietnam
US Servicemen had been fighting communists in South Vietnam since 1955.
North Vietnam (NVA) fighting South Vietnam (ARVN) with the US/allies helping out the south.
North
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.
Yes, Republic of South Korean Servicemen fighting in Vietnam were referred to as ROK's...the ROK Army (Republic of South Korea).
Only a US Airman can answer that question; they flew over it while fighting their air war; the rest of the US servicemen fought in SOUTH Vietnam. not true, people live there
Communist North Vietnam accomplished it's objective of conquering it's neighbor, South Vietnam.
They were showing solidarity with the US.
The US got involved in the Vietnam was because they were trying to sweep out communism across the globe. In the war, the US supported South Vietnam because they were fighting against communist North Vietnam.
To preserve their nation (the Republic of South Vietnam).
The nation (country) of Vietnam didn't exist during the Vietnam War. Nor was any nation called "Vietnam" fighting the US. There was a country called North Vietnam that defeated the Republic of South Vietnam in 1975. The US was allied to the RVN (Republic of South Vietnam).