180504-N-RB168-0036 YOKOSUKA, Japan (May 4, 2018) The Los Angeles- class attack submarine USS Columbia (SSN 771) is moored at Fleet Activities Yokosuka. Columbia is visiting Yokosuka for a port visit. U.S. Navy port visits represent an important opportunity to promote stability and security in the Indo-Pacific region, demonstrate commitment to regional partners and foster relationships. (U.S. Navy photo by Mass Communication Specialist 1st Class Benjamin Dobbs/Released)