180430-M-PK127-1069 PACIFIC OCEAN (April 30, 2018) Marines assigned to the 13th Marine Expeditionary Unit (13th MEU) watch for simulated enemy threats during a defense of the amphibious task force operation aboard the San Antonio-class amphibious transport dock ship USS Anchorage (LPD 23). The Essex Amphibious Ready Group (ARG) and the 13th MEU integrated to conduct the second major exercise of their pre-deployment training. (U.S. Marine Corps photo by Cpl. Austin Mealy/Released)