A reconnaissance Marine with the 15th Marine Expeditionary Unit swims to the USS Arizona, Sept. 19. The swift, silent and deadly divers used the time to sharpen their skills and qualify for some of the unique missions the Marines could be called upon to conduct during the deployment. They viewed USS Arizona Memorial from a unique vantage point of the and simultaneously earned an open-circuit dive qualification. An open-circuit dive is similar to recreational diving since the Marines use oxygen tanks.