U.S. Navy Petty Officer 2nd Class Zachary Skates grinds a piece of metal aboard the amphibious assault ship USS Essex in the Pacific Ocean, Dec. 1, 2015. The Essex and its embarked 15th Marine Expeditionary Unit are operating in the U.S. 3rd Fleet area of operations. U.S. Navy photo by Petty Officer 2nd Class Liam Kennedy