Admiral John S. McCain, Jr. McCain entered the United States Naval Academy in 1927, at age 16. He graduated in 1931. Upon graduation he was commissioned an ensign and assigned to duty aboard the battleship USS Oklahoma in the Pacific.
The USS Oklahoma was based at Pearl Harbor from 6 December 1940 for patrols and exercises, and was moored in Battleship Row on 7 December 1941.
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