191207-N-CZ893-1402 PACIFIC OCEAN (Dec. 7, 2019) Sailors clean the barrel of a Mark 45 5-inch gun aboard the Arleigh Burke-class guided-missile destroyer USS Rafael Peralta (DDG 115), Dec. 7, 2019. Rafael Peralta is underway conducting routine training in the eastern Pacific Ocean. (U.S. Navy photo by Mass Communication Specialist 2nd Class Jason Isaacs/Released)