 While Martin was serving as Ambassador to Thailand, his adopted nephew, Marine 1st Lt Glenn Dill Mann, was killed near Chu Lai, South Vietnam, in November 1965, while attacking enemy positions at Thach Tru with his UH-1 helicopter gunship.1st Lt Mann is buried in Section 3 at Arlington National Cemetery.The helicopter that evacuated the ambassador out of Saigon, on the same day the Vietnam War ended, is on display at the Flying Leatherneck Aviation Museum in San Diego, California.