190510-M-EC058-0340 PACIFIC OCEAN (May 10, 2019) Marines with Marine Medium Tiltrotor Squadron (VMM) 163 (Reinforced), 11th Marine Expeditionary Unit (MEU), perform maintenance on an AV-8B Harrier engine aboard the amphibious assault ship USS Boxer (LHD 4). The Marines and Sailors of the 11th MEU are conducting routine operations as part of the Boxer Amphibious Ready Group. (U.S. Marine Corps photo by Lance Cpl. Dalton S. Swanbeck/Released)