Rebel tanks are drawn up in front of the presidential palace in Saigon, on Nov. 3, 1963, during coup that brought the downfall and death of South Vietnam President Ngo Dinh Diem and his brother Ngo Dinh Nhu.APA man takes a family photo in front of the former presidential palace of the former South Vietnam U.S.-backed regime in Ho Chi Minh City, on April 10, 2015.Hoang Dinh Nam—AFP/Getty ImagesThe body of a South Vietnamese captain is carried on an army tank surrounded by many soldiers and civilians in a funeral procession on Saigon's main street on Nov. 5, 1963. Horst Faas—APHeavy traffic in central Ho Chi Minh City during the morning rush hour on Nov 22, 2014.Sean Gallagher—National Geographic/CorbisNewly landed U.S. Marines make their way through the sands of Red Beach at Da Nang, on their way to reinforce the air base, as South Vietnamese Rangers battled guerrillas about three miles south, on April 10, 1965.Peter Arnett—APStudents play football on the beach in Da Nang on Nov. 19, 2013.Chau Doan—LightRocket/Getty Images