As seen through a night-vision device, a U.S. Marine assesses a simulated casualty during a deck shoot aboard the amphibious assault ship USS Essex in the Indian Ocean, Oct. 31, 2015. The Marine is assigned to the 15th Marine Expeditionary Unit’s Maritime Raid Force. The 15th MEU, embarked on the ships of the Essex Amphibious Ready Group, is deployed to maintain regional security in the U.S. 5th Fleet area of operations. U.S. Marine Corps photo by Sgt. Anna Albrecht