Four Americans gunned down in a withering, four-hour firefight in the Sahara -- part of a 10-man Green Beret team said to have gone rogue and been ambushed by ISIS while hunting down a top terrorist to "capture or kill" -- were ill-prepared, poorly trained and "not indicative" of their high-performing peers on the continent, U.S. military officials said. And in the strangest twist of all, they had been trying to locate an American aid worker who was being held hostage by the terrorist commander they were trying to kill. That story, as presented by the Pentagon, sounded like an...