181012-N-SH168-0587 PACIFIC OCEAN (Oct. 12, 2018) The amphibious assault ship USS Boxer (LHD 4) fires a MK-38 25 mm machine gun as part of a live-fire training exercise. Boxer is underway conducting routine operations in the 3rd Fleet area of operations. (U.S. Navy photo by Mass Communication Specialist 3rd Class John Luke McGovern/Released)