HomeU.S. Military–Marine Security Guard ...Charles McMahon, Jr. hide Charles McMahon, Jr. DS Memorial April 29, 1975 Diplomatic Security Memorial U.S. Military—Marine Security Guard Year of Death: 1975 Cpl. Charles McMahon, Jr., Marine Security Guard (MSG), died on April 29, 1975, in Saigon, South Vietnam, during a Viet Cong rocket attack. His hometown is Woburn, Massachusetts. According to the book, “The Marine Corps and the State Department,” he and MSG Darwin Judge were the last two Americans to die in the Vietnam War. U.S. embassy or consulate. Photo: U.S. Government image Tags DS Military Marine Security Vietnam