Which president was a nuclear engineer officer in the U.S. Navy?

What was Ulysses S. Grant's original first name? What was Bill Clinton's birth name? What was Gerald Ford's birth name? Which president was a famous Rhodes Scholar at Oxford? Which president commanded PT-109 during World War II? Which president was a Navy pilot shot down over the Pacific in World War II? Which president was a college football player at the University of Michigan and turned down NFL offers? Which president was a sportscaster for the Chicago Cubs on radio before acting?