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(VIETNAM-25, 1/3) A Vietcong tank takes up a position in front of the presidential palace of the US-backed Southern Vietnamese regime 30 April 1975 in Saigon on the day that the city fell to communist troops. Letting bygones be bygones, the United States and Vietnam have taken modest steps toward a rapprochement a quarter century after the chaotic US departure from Saigon. AFP PHOTO (Photo credit should read -/AFP/Getty Images)

(VIETNAM-25, 1/3) A Vietcong tank takes up a position in front of the presidential palace of the US-backed Southern Vietnamese regime 30 April 1975 in Saigon on the day that the city fell to communist troops. Letting bygones be bygones, the United States and Vietnam have taken modest steps toward a rapprochement a quarter century after the chaotic US departure from Saigon. AFP PHOTO (Photo credit should read -/AFP/Getty Images)