It was one of America's longest-running wars. U.S. involvement began in 1954 with a few hundred troops advising national and then Democratic forces in a civil war. U.S. involvement grew and, in 1961, President John F. Kennedy authorized a massive increase in troop deployments to the country. 58,000 Americans would die before the U.S. left the conflict in 1973 and South Vietnam fell in 1975.
Here are 12 photos from the U.S. Army Heritage and Education Center that you won't see in most textbooks and history papers: