160505-N-TW634-039 SAN DIEGO (May 5, 2016) The Los Angeles-class fast attack submarine USS Oklahoma City (SSN 723), assigned to Commander, Submarine Squadron 15, enters the floating dry dock Arco (ARDM 5) for a scheduled maintenance period. Arco is a Commander, Submarine Squadron 11 asset under the operational control of Commander, Submarine Force, U.S. Pacific Fleet. (U.S. Navy photo by Mass Communication Specialist 3rd Class Derek A. Harkins/Released)