|Helicopter Sea Combat Squadron TWO ONE|
HSC-21 Blackhawks Insignia
|Active||1977 - present|
|Country||United States of America|
|Branch||United States Navy|
|Role||Search and Rescue (SAR)
Naval Special Warfare (NSW)
Vertical Replenishment (VERTREP)
Medical Evacuation (MEDEVAC)
|Garrison/HQ||Naval Air Station North Island|
|Commander Gregory Leland|
HSC-21 Helicopter Sea Combat Squadron Two One, also known as the Blackjacks, are a United States Navy helicopter squadron based at Naval Air Station North Island. HSC-21 is made up of five expeditionary detachments that deploy aboard ships including Combat Logistics Force support ships and Amphibious Assault ships, among others, and shore base as a part of the 2515th Naval Air Ambulance Detachment, Udari Army Airfield, Kuwait. HSC-21 flies the MH-60S "Knighthawk" helicopter.
Helicopter Sea Combat Squadron TWO ONE, formerly the Gunbearers of HC-11, has been the cornerstone for West Coast Fleet Logistics Support since the original squadron was established on October 1, 1977 at Naval Air Station North Island, San Diego, California. In April 2005, the Gunbearers of HC-11 were redesignated as the Blackjacks of HSC-21, continuing a tradition of excellence to support the Navy’s future helicopter fleet organization.
See also 
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