151210-N-KR961-428 PACIFIC OCEAN (Dec. 10, 2015) Dock landing ship USS Harpers Ferry (LSD 49) makes an approach to come alongside amphibious assault ship USS Boxer (LHD 4) for replenishment at sea (RAS). Boxer’s capability of providing fuel to another ship underway demonstrates the ability for the Amphibious Ready Group to sustain itself at sea for extended periods. 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 Communication Specialist 2nd Class Debra Daco/Released)