180803-N-KC128-165 PEARL HARBOR (Aug. 3, 2018) A Sailor assigned to the Los Angeles-class fast-attack submarine USS Columbia (SSN 771) lowers the Submarine Squadron Seven flag during the change of command ceremony on the historic submarine piers at Joint Base Pearl Harbor-Hickam. Cmdr. Tyler Forrest relieved Cmdr. Dave Edgerton as Columbia’s commanding officer. (U.S. Navy photo by Mass Communication Specialist 1st Class Daniel Hinton)