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USS Washtucna YTB. United States Navy large harbor tug USS Washtucna YTB lower right assisting submarine USS La Jolla SSN into her berth outboard of submarine USS Plunger SSN at Submarine Base San Diego California on July In the background is submarine tender USS Dixon AS navsource org htm DVIC photo DNST by PH Randy Hays PDUSGovMilitaryNavy