no

Korea, Australia, Phillipines, and Canada all pitched in during the Vietnam war alongside the U.S. effort to preserve democracy in South Vietnam.

none

Because Vietnam is the name of the country in which the war was fought.

If the war was fought in Germany, it could have been called the "German War."

Or in Canada, the "Canadian War", etc.

Canada was officially neutral during the Vietnam War; however thousands of Canadians enlisted into the US military to help fight the war; this action was rumored to be some of Canada's patriot's efforts to offset the number of US draft dodgers entering Canada. Over 100 Canadian men were killed in the Vietnam War.