150811-N-CB621-429 PEARL HARBOR, Hawaii (Aug. 10, 2015) Chief Electrician's Mate Derek Diener, assigned to the Los Angeles-class attack submarine USS Columbus (SSN 762), greets his daughters following the return of the submarine to Joint Base Pearl Harbor-Hickam after completing a six-month deployment. (U.S. Navy photo by Mass Communication Specialist 1st Class Jason Swink/Released)