180720-N-KC128-106 JOINT BASE PEARL HARBOR, Hawaii (July 20, 2018) Midshipmen familiarize themselves with the periscope aboard the Los Angeles-class fast-attack submarine USS Columbia (SSN 771) in Pearl Harbor, Hawaii, during their midshipman summer cruise, July 20, 2018. (U.S. Navy photo by Mass Communication Specialist 1st Class Daniel Hinton/Released)