SAN DIEGO (Jan. 26, 2021) Aviation Machinist Mate 3rd Class Kristian Oblianbirindzic, from Denver, performs maintenance on an MH-60S Sea Hawk helicopter from �Black Knights� Helicopter Sea Combat Squadron (HSC) 4 in the hangar bay of the aircraft carrier USS Carl Vinson (CVN 70). Carl Vinson is currently pierside in its homeport of San Diego. (U.S. Navy photo by Mass Communication Specialist Seaman Apprentice Mason Congleton)