Chief Navy Diver Chris Kerr, assigned to Mobile Diving and Salvage Unit ONE, takes a front step off a barge into the Gulf of Tonkin off the coast of Northern Vietnam, May 27, 2015. Kerr is part of a Defense POW/MIA Accountability Agency underwater recovery team searching for two aviators who are believed to have crashed in the area during the Vietnam War. (U.S. Navy photo by Mass Communication Specialist 1st Class Brett Cote/RELEASED)