Burma was neutral.
Thailand was an ally of the US.
US war in RVN commenced in 1955. US war against North Vietnam commenced in 1964.
It provided a force to assist the South Vietnam government resist the North Vietnamese attempt to take it over.
Yes, South Korea is an ally of the Republic of Vietnam. During the Vietnam War, South Korea helped the United States and the Republic of Vietnam to fight against the communists. The Republic of Vietnam was helped by South Korea, by the United States, by Thailand, by Taiwan, by New Zealand, by Australia, by Singapore and by Malaysia!
Australia, New Zealand, the Phillipenes, South Korea and South Vienam.
Nationalist China was an ally but did not send troops. The others were neutral.
Laos was neutral.
South Vietnam was considered an ally of the US.
The Philippines consider them as an Ally, Spain-American War. WW2, Vietnam,Korea war. War on Terror.
Although Burma borders India, both Burma and Vietnam are in Southeast Asia.
China
Australians.
Thailand was an ally of the US.
Australia was an ally of the US and sent troops to fight in both WWII and Vietnam.
US, S. Korea, S. Vietnam, Philippines, Thailand, New Zealand.
Great Britain was a "supportive" ally during the Vietnam War.