<p>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. Wikipedia 
</p><p>Naval Base San Diego
USS Essex (LHD-2)
Family Reunion 2016
Photo: TDelCoro
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March 4, 2016
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/45549579@N05">Tomás Del Coro</a> from Las Vegas, Nevada, USA
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/tomasdelcoro/25494974220/">Helicopter Sea Combat Squadron 21 (HSC-21) "Blackjacks",</a>