JOINT BASE PEARL HARBOR-HICKAM (April 7, 2021) Cmdr. Andrew J. Kopacz delivers remarks during a change of command ceremony for the Los Angeles-class fast-attack submarine USS Chicago (SSN 721), April 7, 2021. Kopacz relieved Cmdr. Chance Litton as Chicago's commanding officer during the ceremony on the historic submarine piers at Joint Base Pearl Harbor-Hickam. (U.S. Navy photo by Chief Mass Communication Specialist Amanda R. Gray)