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uss nimitz cvn ussnimitzcvn CFDDNST crewman performs maintenance on MkPhalanx close in weapon system CIWS aboard the nuclearpowered aircraft carrier USS Nimitz CVN June JOC Fred J. Klinkenberger Jr. OPANARA II CFDDNST crewman performs maintenance on MkPhalanx close in weapon system CIWS aboard the nuclearpowered aircraft carrier