FILE - In this April 29, 1975, file photo, a helicopter lifts off from the U.S. embassy in Saigon, Vietnam, during the evacuation of authorized personnel and civilians. More than two bitter decades of war in Vietnam ended with the last days of April 1975. Today, 40 years later, former Associated Press correspondent Peter Arnett has written a new memoir, “Saigon Has Fallen,” detailing his experience covering the war for The AP. (AP Photo/File)

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