BANGOR, Wash. (May 6, 2016) - The Ohio-class ballistic-missile submarine USS Pennsylvania (SSBN 735) returns to Naval Base Kitsap-Bangor following a routine strategic deterrent patrol. Pennsylvania is one of eight ballistic-missile submarines stationed at the base providing the most survivable leg of the strategic deterrence triad for the United States. (U.S. Navy photo by Lt. Cmdr. Michael Smith/Released)