In Paris, Pres. Richard Nixon signed a Peace Treaty in 27 January 1973 after rounds of Peace talks between the North Vietnam, South Vietnam and the White House. An agreement was made including ceasing fire, releasing of P.O.W.s, etc.
Then the American troops were withdrawn from South Vietnam. The war continued until 30 April 1975 with the Fall of Saigon, when the country was reunited under communism.
The posters encourage average Americans to contribute to the war effort because it gave them drive to support United States in victory, "poster was an ideal agent for making victory the personal mission of every citizen".