Helicopter Sea Combat Squadron 21 (HSC-21), nicknamed “Blackjacks”, is an aviation unit of the US Navy based at NAS North Island. HSC-21 is made up of five expeditionary detachments that deploy aboard ships including Combat Logistics Force support ships, Hospital Ships and Amphibious Assault ships, among others. HSC-21 flies the Sikorsky MH-60S Seahawk helicopter currently. This patch was created for their 2019 detachment for those that were away from home during the holidays…..and does not come with velcro attached.
