Which president was a mining engineer before entering politics?

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? Which president was a haberdasher (men's clothing seller) in Kansas City? Which president was a newspaper publisher in Marion, Ohio? Which president was a professor and president of Princeton University? Which president was a tailor in Tennessee before politics? Which president was a real estate developer and host of 'The Apprentice'?