170905-N-WI626-102 APRA HARBOR, Guam (Sept. 5, 2017) The Los Angeles-class attack submarine USS Chicago (SSN 721) departs Apra Harbor, Guam, for the last time as a homeported Guam unit. Chicago is slated to change its homeport to Pearl Harbor, Hawaii, following a scheduled maintenance period. (U.S. Navy photo by Lt. Lauren Spaziano/Released)