180606-N-LY160-0098 PEARL HARBOR (June 6, 2018) Sailors assigned to the Los Angeles-class fast-attack submarine USS Columbia (SSN 771) prepare to disembark the boat at the historic submarine piers at Joint Base Pearl Harbor-Hickam, Hawaii, following a six-month western Pacific deployment. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael H. Lee/Released)