170405-N-DZ075-0024 SOUTH CHINA SEA (April 5, 2017) Sailors assigned to the Arleigh Burke-class guided-missile destroyer USS Stethem (DDG 63) conduct maintenance on a MK 38 25 mm machine-gun prior to a live-fire exercise. Stethem is on patrol in the South China Sea supporting security and stability in the Indo-Asia-Pacific region. (U.S. Navy photo by Mass Communication Specialist 2nd Class Ryan Harper/Released)