The aircraft carrier USS Theodore Roosevelt (CVN 71) and the guided-missile cruiser USS Normandy (CG) 60 sail in the Arabian Sea, in this U.S. Navy photo taken April 16, 2015. The ships will join seven other U.S. warships in the waters near Yemen, which is torn by civil strife as Iranian-backed Houthi rebels battle forces loyal to the U.S.-backed president. (Photo by Mass Communication Specialist Seaman Anna Van Nuys/Reuters/U.S. Navy)
