160722-N-WI626-064 SANTA RITA, Guam (July 22, 2016) Cmdr. Brian Turney, right, commanding officer of the Los Angeles-class attack submarine USS Chicago (SSN 721), and Chief Fire Control Technician Shaun Wintink discuss the boat's fire control system with Under Secretary of the Navy Janine Davidson, during a tour of the submarine. Chicago is one of four submarines assigned to Commander, Submarine Squadron 15 and forward-deployed out of Polaris Point, Guam, also homeport to the Navy's only two submarine tenders. (U.S. Navy photo by Lieutenant Lauren Spaziano/Released)