The Vietnam War was a war fought in the eponymous nation. The United States participated.
History 
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Due to President Lyndon Johnson's pursuit of the Vietnam War, he was reviled by the counterculture movement in the United States. (PROSE: Wonderland)
In the 1960s, the Fifth Doctor, Nyssa, Wilton, Mulberry and Floyd visited Vietnam during the war and met Major Alice Hunniford. (AUDIO: Renaissance of the Daleks)
In 1965, the Latter-Day Pantheon decided to end the Vietnam War, but they were stopped by the US Army before they could finish with their plan. (PROSE: Salvation)
Igrix intended to stop the Vietnam War in 1968. (COMIC: The Love Invasion)
On 24 December 1969, the Third Doctor and Sarah Jane Smith visited Saigon in Vietnam during the Christmas ceasefire. (PROSE: Interesting Times)
River Song noted President Richard Nixon's involvement in Watergate and the Vietnam War before adding that there was "some good stuff too." (TV: The Impossible Astronaut)
The war ended on 23 February 1973, with no clear victor. The American soldiers who returned from Vietnam were met with contempt by the American public. (PROSE: Nuclear Time)
