Question: 美国是何时从越南战争退出的
Answer: 1973-03-29; 29 03 1973; 03-29-1973; 29 3月 1973; 29-03-1973; 1973 march, 29; 29/03/1973; 1973-03-29; 1973 03 29; 03 29 1973; 03/29/1973; 1973 3月 29