SOUTH Vietnam was called the "REPUBLIC of South Vietnam." Everyone in those days just called North Vietnam...NORTH VIETNAM.
There is no country called South Vietnam anymore.
There was no country called "Vietnam" during the war. There was a country called North Vietnam and another country called South Vietnam, which one are you asking about?
GI's called em Nationals in country, or Viet civilians; GI's called the South Vietnamese soldier, ARVN's (jokingly, ARVN the Marvin) (Army Republic of South Vietnam).
When the Vietnam War ended in 1975, North and South Vietnam became one communist nation called Vietnam.
Viet Cong-
Vote cong
The nation of North Vietnam (which no longer exists...it's called Vietnam today). The country that the US was allied to, South Vietnam, doesn't exist either...it was consumed by North Vietnam. The official name of SOUTH Vietnam was 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).
Two separate countries: South Vietnam was officially called RVN (Republic of South Vietnam). When US servicemen landed in country, they were greeted with "Welcome to the Republic of South Vietnam" (enjoy your stay).
Formally it was two nations: North and South Vietnam. Yes, today it is one unified country (nation)...called Vietnam.
The DMZ (Demilitarized Zone) which was located at the 17th Parallel.