The U.S. military personnel carry a casket containing remains which is believed to be the U.S. servicemen, missing in action during the Vietnam War as U.S. Secretary of State Hillary Rodham Clinton witnesses during a repatriation ceremony at the airport in Hanoi, Friday, July 23, 2010. (AP Photo/Kham, Pool)

Photo by: Kham

The U.S. military personnel carry a casket containing remains which is believed to be the U.S. servicemen, missing in action during the Vietnam War as U.S. Secretary of State Hillary Rodham Clinton witnesses during a repatriation ceremony at the airport in Hanoi, Friday, July 23, 2010. (AP Photo/Kham, Pool)