Saigon, was the capital of the French colony of Cochin-china and became the independent republic of South Vietnam from 1955–75. Southern Vietnam, was anti-communist and fought against the communist North Vietnamese and Viet Cong during the Vietnam War. The USA, Australia, New Zealand, South Korea and the Philippines assisted Southern Vietnam in the war against communism.
Although the US military pulled out of Vietnam in 1973, the last of the troops leaving on March 29th 1973, Some military personnel were required to guard American installations and US Marines continued to guard the US Embassy in Saigon until the end.
The North Vietnamese forces under the command of  General Văn Tiến Dũng attacked Saigon on April 29th after a heavy artillery bombardment. By the afternoon of the next day, he North Vietnamese troops had captured the strategic locations within the city and had raised their flag over the South Vietnamese presidential palace. The whole of the South Vietnam was soon in the hands of the communists . Almost all the American civilian and military personnel in Saigon, along with tens of thousands of South Vietnamese civilians were evacuated during "Operation Frequent Wind", which was the largest helicopter evacuation in history.

 Saigon was taken by the Communist force on the 30th April 1975 thus defeating Southern Vietnam and its forces. The war against communism was over and Vietnam was then turned into a communist state. 

 On 2 July 1976, Saigon merged with the surrounding Gia Định Province and was officially renamed Ho Chi Minh City after Hồ Chí Minh the communist revolutionary leader who was prime minister (1945–1955) and president (1945–1969).   He was the founder of the Democratic Republic of Vietnam in 1945, as well as the People’s Army of Vietnam (PAVN) and the Việt Cộng (NLF or VC).