Filo/Getty Images(WASHINGTON) -- The U.S. military has unleashed large-scale retaliatory airstrikes against multiple Houthi targets in Yemen following months of attacks by the Iranian-backed militants on commercial shipping in the Red Sea, a U.S. official said Thursday. The official said that the strikes involved a mix of fighter jets and Tomahawk cruise missiles launched from Navy surface ships and a U.S. Navy submarine, according to two U.S. officials. One of the officials identified the submarine as the Ohio-class ballistic missile submarine USS Florida, which was seen entering the Red Sea ...