text: This event was preceded by the battle of Xuan Loc and the capture of Buon Ma Thua.
full_question: This event was preceded by the battle of Xuan Loc and the capture of Buon Ma Thua. As it approached, Ambassador Graham Martin was placed in charge of operation Frequent Wind, during which some 7,000 people were transported to US Navy ships off the coast. President Nguyen Van Thieu resigned nine days before it happened. Today, in the country in which this event occurred, its anniversary is celebrated as Reunification Day. The final event in the Vietnam War, this is for ten points what April 30, 1975 event in which the North Vietnamese Army captured the capital of South Vietnam?
first_sentence: This event was preceded by the battle of Xuan Loc and the capture of Buon Ma Thua.