200214-N-YD647-0128 SANTA RITA, Guam (Feb. 14, 2020) Information System Technician (Submarine) 2nd Class Kristopher Parker, a native of Hubert, N.C., assigned to the Los Angeles-class fast attack submarine USS Oklahoma City (SSN 723), helps a student don a self-contained breathing apparatus (SCBA) during a hands-on demonstration at the Cmdr. William C. McCool Elementary School on Naval Base Guam. Oklahoma City is one of four forward-deployed submarines assigned to Commander, Submarine Squadron Fifteen out of Apra Harbor, Guam. (U.S. Navy photo by Mass Communication Specialist 2nd Class Destinyy Reed/Released)