Most famously the Korean and Vietnam Wars, although there were others.
Japan fought Vietnam during that war
Vietnam...
The ground war, in the Vietnam War, WAS FOUGHT in SOUTH VIETNAM. Therefore, South Vietnam entered the war from the very beginning...which is when it started in either the late 1950's or 1961, depending on what historical reference you are using.
The "Air War" was fought over North Vietnam. The "Ground War" was fought in South Vietnam.
The State That Fought At The Vietnam War Was The united States
The French were fighting in Vietnam in 1950 not the US.
A military officer that fought in the Vietnam War. A Vietnam War soldier would be a "soldier that fought in the Vietnam War.
The question should read, "...tried to REGAIN control..."; France.
The USAF & USN fought in NORTH Vietnam (in the skies); the US Army & USMC fought on the ground in SOUTH Vietnam.
Japan fought Vietnam during that war
The Korean War (1950-1953) & The Vietnam War (1961-1975) were "Hot" battles of the "Cold War."