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170306-N-ED185-013 FLEET ACTIVITIES YOKOSUKA, Japan (March 6, 2017) Mark Gucherau, an electronic technician aboard the Pathfinder-class oceanographic survey ship USNS Henson (T-AGS 63) explains the ship’s Naval Oceanographic Office Glider system to Rear Adm. Richard A. Correll, commander, Submarine Group 7. Henson is visiting Yokosuka for a port visit.