151204-N-VS214-027 PACIFIC OCEAN (Dec. 04, 2015) Hull Technician 3rd Class Antwan Prince works in the machine shop of dock landing ship USS Harpers Ferry (LSD 49). The Boxer Amphibious Ready Group (ARG) is underway off the coast of Southern California completing a certification exercise (CERTEX). CERTEX is the final evaluation of the 13th Marine Expeditionary Unit (13th MEU) and Boxer ARG prior to deployment and is intended to certify their readiness to conduct integrated missions across the full spectrum of military operations. (U.S. Navy photo by Mass Communications Specialist 3rd Class Zachary Eshleman/Released)