Arthur Macarthur was a brave teenaged officer in the Civil War. He won the Medal of Honor at 18, and was a Lt. Col by the age of 19. Years later his son, Douglas MacArthur, would also win the Medal of Honor - making them one of only two Father-Son recipients of the Medal of Honor.
John Quincy Adams - 6th President of U.S. - son of John Adams, (2nd President). He served as Secretary of State under James Monroe, and is regarded as one of the greatest diplomats in American history. He reportedly had the highest IQ of any American President. He died in 1848 at the age of 81.
General Douglas MacArthur commanded the U.S. forces in the Pacific during World War II. At the end of the war, President Harry Truman appointed MacArthur to oversee the U.S. occupation of Japan; MacArthur directed changes that induced Emperor Hirohito to help his country move away from its militant culture to a more peaceful and egalitarian society.