160428-N-UK333-061 SAN DIEGO (April 28, 2016) Master Chief Petty Officer of the Navy (MCPON) Mike Stevens speaks with Chief Machinist’s Mate (Weapons) Christian Graglia during a tour aboard the Los Angeles-class fast attack submarine USS Alexandria (SSN 757), homeported in Naval Base Point Loma. The MCPON visited with Sailors and discussed current topics, including rating changes and uniform regulations. (U.S. Navy photo by Mass Communication Specialist 1st Class Ronald Gutridge/Released)