FILE - In this March 29, 1973 file photo, Unidentified U.S. prisoners of war stand in the courtyard of Hanoi's POW camp at Nga Tu So street waiting for an inspection of the camp by joint military and international control and supervision commissions. On Thursday, May 24, 2013, some 200 former POWs, almost all of them former pilots, will reunite for a three-day celebration at the Richard Nixon Presidential Library & Museum in Yorba LInda, Calif., that coincides with the 40th anniversary of a star-studded White House dinner hosted by President Nixon to honor their sacrifice. At the time, Nixon was embroiled in Watergate, but the former prisoners, now in their 60s and 70s, credit him with their freedom and have no qualms about expressing their loyalty for the 37th president. (AP Photo/Horst Faas, File)