Historians are finding it difficult to find out what year the Vietnam War started, let alone the month or day. However, some of the first recorded US casualties occurring to the US Military Assistance Group in South Vietnam occurred on 08 July 1959. Reference: Vietnam Conflict Map, by C.S. Hammond and Co.
See website: Vietnam War
12 February 1955.
1 November 1955
There is no day for the Vietnam vets. Instead there is a veteran day for all in November.
Eisenhower first dispatched US Troops to RVN in February 1955.
1955 South Vietnam.
See website: Vietnam War
1963
Australia never fought Vietnam.
1869
You mean "When did the Vietnam War start?" or "when did Vietnam the country begin" The Vietnam War officially started in the early 1950s, when France refused to give independence to French Indochina (Vietnam, Laos,Cambodia). The French surrendered in 1954, and Vietnam gained independence as two separate countries in 1955. The US involvement lasted from 1957 until 1975. Modern day Vietnam was founded in 1976.
They never heard of Vietnam before.