NAVAL AIR FACILITY EL CENTRO, Calif. (Oct. 2, 2020) Crew members aboard an MH-60S Sea Hawk helicopter assigned to the "Black Knights" of Helicopter Sea Combat Squadron (HSC) 4, stationed in San Diego, participate in a personnel recovery mission exercise designed to retrieve fallen crew members in hostile territory. HSC-4 provides vertical lift search and rescue, logistics, anti-surface warfare, special operations forces support and combat search and rescue capabilities. (U.S. Navy photo by Chief Mass Communication Specialist Shannon Renfroe)