Operations Specialist Seaman Recruit Stephen Roycroft punches a bag held by Hospitalman Ndudic Chukwudozie during the mechanical

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PACIFIC OCEAN (Nov. 18, 2010) Operations Specialist Seaman Recruit Stephen Roycroft, right, punches a bag held by Hospitalman Ndudic Chukwudozie during the mechanical advantage control hold portion of a Naval Security Force armed sentry training course held aboard the amphibious dock landing ship USS Tortuga (LSD 46). Tortuga is part of the permanently forward-deployed Essex Amphibious Ready Group and is underway in the western Pacific Ocean. (U.S. Navy photo by Mass Communication Specialist 1st Class Richard Doolin/Released)

101118-N-8335D-203
 PACIFIC OCEAN (Nov. 18, 2010) Operations Specialist Seaman Recruit Stephen Roycroft, right, punches a bag held by Hospitalman Ndudic Chukwudozie during the mechanical advantage control hold portion of a Naval Security Force armed sentry training course held aboard the amphibious dock landing ship USS Tortuga (LSD 46). Tortuga is part of the permanently forward-deployed Essex Amphibious Ready Group and is underway in the western Pacific Ocean. (U.S. Navy photo by Mass Communication Specialist 1st Class Richard Doolin/Released)