151210-N-YG354-081 PACIFIC OCEAN (Dec. 10, 2015) LtCol. Jonathan Smith, Commanding Officer, 2nd Battalion, 1st Marines (center) talks with Capt. Sean Callison while seated in an AV-8B Harrier II, attached to Marine Medium Tilt Rotor Squadron (VMM) 166 (Reinforced) on board amphibious assault ship USS Boxer (LHD 4). 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 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 1st Class Douglas Bedford/Released)