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US Navy NFI Sonar Technician Surface nd Class Gareth Erasmus right and Gunner's Mate nd Class Justin McKay fire Mk mm m. en ATLANTIC OCEAN Dec Sonar Technician Surface nd Class Gareth Erasmus right and Gunner's Mate nd Class Justin McKay fire Mk mm machine gun aboard the Arleigh Burkeclass guidedmissile destroyer USS Porter DDG