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Naval Air Crewman (Helicopter) 2nd Javier Rosas, from San Mateo, Calif, left, and Lt. Garret Smart, from Draper, Utah, conduct a preflight inspection of a MH-60S Sea Hawk helicopter, attached to the “Blackjacks” of Helicopter Sea Combat (HSC) Squadron 21, prior to flight operations aboard Independence-variant littoral combat ship USS Charleston (LCS 18).