151031-N-AX546-037 ADRIATIC SEA (Oct. 31, 2015) USS Porter (DDG 78) heads out to sea Oct. 31, 2015 after a port visit to Split, Croatia. Porter, an Arleigh Burke-class guided-missile destroyer, forward-deployed to Rota, Spain, is on a routine patrol conducting naval operations in the U.S. 6th Fleet area of operations in support of U.S. national security interests in Europe. (U.S. Navy photo by Mass Communication Specialist 1st Class Sean Spratt/Released)