180505-N-AT135-256 (PACIFIC OCEAN) May 5, 2018 �? A 25mm machine gun system fires from the fantail during a live-fire exercise aboard the Wasp-class amphibious assault ship USS Essex (LHD 2) during Essex Amphibious Ready Group (ARG) and 13th Marine Expeditionary Unit (MEU) exercise (ARGMEUEX). ARGMEUEX enhances joint integration, lethality and collective capabilities of the Navy-Marine team through joint planning and execution of challenging and realistic training scenarios. (U.S. Navy photo by Mass Communication Specialist 3rd Class Matthew Freeman/Released)