180123-N-VD165-141 SAN DIEGO (Jan. 23, 2018) Fireman Nathan James places Collective Protection System M98 chemical, biological, radiological, nuclear filters on the flight deck aboard the amphibious assault ship USS Boxer (LHD 4). Boxer at homeport preparing for contractor sea trials. (U.S. Navy photo by Mass Communication Specialist 2nd Class Jose Jaen/Released)