U.S. Navy Diver 2nd Class William Sherman, assigned to Mobile Diving and Salvage Unit 1, adjusts his diving mask before a dive during a Joint Prisoners of War, Missing in Action Accounting Command (JPAC) underwater recovery mission in Thua Thien Hue, Vietnam, June 4, 2011. The JPAC recovery teams searched at burial sites and underwater for the remains of 13 Americans from the Vietnam War era.