180626-N-TW634-047 SAN DIEGO (June 26, 2018) Sailors handle lines aboard the Chilean Submarine (CS) Simpson (SS 21) as it arrives at Naval Base Point Loma. Simpson is deployed in support of the Diesel-Electric Submarine Initiative (DESI), which enhances the Navy’s ability to operate with diesel-electric submarines by partnering with South American navies. (U.S. Navy photo by Mass Communication Specialist 2nd Class Derek Harkins/Released)