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Helicopter Sea Combat Squadron 21
Helicopter Sea Combat Squadron 21 (US Navy) patch 2015.png
HSC-21 Blackjacks Insignia
Active 1977 - present
Country  United States of America
Branch United States Navy Seal United States Navy
Role Search and Rescue (SAR)
Logistical Support
Naval Special Warfare (NSW)
Anti-Surface Warfare (ASUW)
Vertical Replenishment (VERTREP)
Medical Evacuation (MEDEVAC)
Part of CDR Davis Wells (FEB 2015-Present)
Garrison/HQ Naval Air Station North Island
Nickname(s) Blackjacks
CDR David Wells (FEB 2015-Present)
Squadron insignia during the period of designation as HC-11

Helicopter Sea Combat Squadron 21 (HSC-21), nicknamed "Blackjacks", is an aviation unit of the United States Navy 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, Hospital Ships and Amphibious Assault ships, among others. HSC-21 flies the Sikorsky MH-60S Seahawk helicopter.


HSC-21 was established as Helicopter Combat Support Squadron 11 (HC-11) "Gunbearers" on 1 October 1977 at of Naval Air Station North Island, San Diego, California (United States), to provide logistics support for the units of the United States Pacific Fleet. In April 2005, HC-11 was redesignated HSC-21 "Blackjacks". During Operation Iraqi Freedom HSC-21 had shore base detachment as a part of the 2515th Naval Air Ambulance Detachment, Udari Army Airfield, Kuwait. This detachment closed in Fall 2012.

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