** ADVANCE FOR WEEKEND JULY 7-8 ** FILE ** Former U.S. Congressman Billy Hendon points to a location on a map of Vietnam where he says he has irrefutable proof that U.S. POWs are being held, at a press briefing in Hanoi, Monday, June 5, 1995. He published "An Enormous Crime" in late May, 2007, a 587-page book filled with declassified government documents he and co-author Elizabeth Stewart believe prove that living Americans were left behind in Southeast Asia after the fall of Saigon in 1975. (AP Photo/Lois Raimondo)