190925-N-AY639-1016 APRA HARBOR, Guam (Sept. 25, 2019) Lt. James Santelli, from Oyster Bay, N.Y., teaches visitors how to use emergency air breathing devices during a family day cruise aboard Los Angeles-class fast attack subamarine USS Oklahoma City (SSN 723). USS Oklahoma City is one of four forward-deployed submarines assigned to Commander, Submarine Squadron Fifteen.(U.S. Navy photo by Lt. j.g. Meagan Morrison/Released)