In 1954, U.S. Pres. Dwight D. Eisenhower supported this program to aid South Vietnam through psychological warfare and paramilitary activities.By David MillerIn U.S. Trivia, History TriviaI View AnswerSaigon Military Mission.The Vietnam War pitted communist North Vietnam against the U.S.-backed South Vietnam government. It lasted from 1955 to 1975.