180712-N-OL781-0015 PACIFIC OCEAN (July 12, 2018) Aviation Machinist’s Mate 2nd Class Katherine Laff performs maintenance on an MH-60S Sea Hawk helicopter assigned to the “Black Knights�? of Helicopter Sea Combat Squadron (HSC) 4 in the hangar bay of Nimitz-class aircraft carrier USS Carl Vinson (CVN 70). (U.S. Navy photo by Mass Communication Specialist Seaman Apprentice Ellen Sharkey/Released)