Retired Marine Corps Gen. James "Mad Dog" Mattis has been selected by President-elect Donald Trump to serve as the next defense secretary. Trump announced the pick Dec. 1 during an evening rally in Ohio, though news of Mattis' selection was first reported by the Washington Post and CNN . Mattis, who retired in 2013 after serving as chief of U.S. Central Command, would require special legislative action to serve as defense secretary because he has not been out of...