PACIFIC OCEAN Sailors from the “Blackjacks” of Helicopter Sea Combat Squadron 21 perform maintenance on an MH-60S Sea Hawk helicopter on the flight deck of Wasp-class amphibious assault ship USS Essex. Essex is underway participating in a Composite Training Unit Exercise  with the Essex Amphibious Ready Group, which is comprised of Amphibious Squadron THREE and 15th Marine Expeditionary Unit.
March 17, 2015
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