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Cpl. Gernard Rathbun, 22nd Marine Expeditionary Unit armorer, treads water in the training pool at Marine Corps Base Camp Lejeune, N.C., for annual swim qualification April 5, 2013. The unit is constantly training to maintain a high state of readiness. (Marine Corps photo by Sgt. Austin Hazard/Released) - Cpl. Gernard Rathbun, 22nd Marine Expeditionary Unit armorer, treads water in the training pool at Marine Corps Base Camp Lejeune, N.C., for annual swim qualification April 5, 2013. The unit is constantly training to maintain a high state of readiness. (Marine Corps photo by Sgt. Austin Hazard/Released)