Australia deployed a regiment of their Centurion tanks to Vietnam.
Laos was neutral.
Burma 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.
Australians.
China
Thailand was an ally of the US.
Australia was an ally of the US and sent troops to fight in both WWII and Vietnam.
Great Britain was a "supportive" ally during the Vietnam War.
US war in RVN commenced in 1955. US war against North Vietnam commenced in 1964.