premise: John S. McCain Jr. registered into the submarine service.
hypothesis: John Sidney `` Jack '' McCain Jr. ( January 17 , 1911 -- March 22 , 1981 ) was a United States Navy admiral , who served in conflicts from the 1940s through the 1970s , including as the Commander , United States Pacific Command . McCain grew up in Washington , D.C. , and graduated from the U.S. Naval Academy in 1931 , after which he entered the submarine service .