FILE - This March 17, 1973 file photo shows released prisoner of war Lt. Col. Robert L. Stirm being greeted by his family at Travis Air Force Base in Fairfield, Calif., as he returns home from the Vietnam War. In the lead is Stirm's daughter Lori, 15; followed by son Robert, 14; daughter Cynthia, 11; wife Loretta and son Roger, 12. 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. This photo won the Pulitzer Prize for News Photography in 1973. (AP Photo/Sal Veder, File)