John S. McCain
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Three generations of notable Americans have shared the name John Sidney McCain:
- John S. McCain, Sr. (1884–1945), was a Navy admiral during World War II.
- John S. McCain, Jr. (1911–1981), his son, was a submarine commander during World War II, and an admiral during the Vietnam War.
- John S. McCain III (born 1936), his son, was a POW during the Vietnam War, and is a senator from Arizona.