After leaving office in 1993, Bush was active in humanitarian activities, often working alongside Clinton, his former opponent. Historians generally rank Bush as an above average president. === Marriage and college years === On December 7, 1941, Japan attacked the American naval base of Pearl Harbor, marking the start of U.S. participation in World War II. On his 18th birthday, immediately after graduating from Phillips Academy, he enlisted in the United States Navy as a naval aviator. In early 1945, he was assigned to a new combat squadron, VT-153, where he trained to take part in an invasion of mainland Japan.
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