PACIFIC OCEAN (April 24, 2021) A Mark 38 25mm machine gun system fires during a live-fire exercise aboard the amphibious assault ship USS Essex (LHD 2). Sailors and Marines of the Essex Amphibious Ready Group (ARG) and the 11th Marine Expeditionary Unit (MEU) are conducting routine training off the coast of southern California. Together, the 11th MEU, Amphibious Squadron (PHIBRON) 1, and ships are designated as an ARG. (U.S. Navy photo by Mass Communication Specialist 3rd Class Wesley Richardson)