In this 1968 black-and-white US Air Force photo, via the Reading Eagle, Sgt. Richard L. Etchberger, a native of Hamburg, Pa., is shown during the Vietnam war. President Barack Obama awarded the Medal of Honor to Etchberger, an airman killed during combat in Laos in 1968. (AP Photo/USAF, Reading Eagle)
American fighter jets prepare to take off from the USS George Washington, cruising in the South China Sea about 200 miles off Vietnam's central coast on Sunday, Aug. 8, 2010. (AP Photo/Margie Mason)
U.S. Secretary of State Hillary Rodham Clinton, right, signs the Treaty of Amity and Cooperation along with others at the end of the 17th ASEAN Regional Forum (ARF), in Hanoi, Vietnam, Friday, July 23, 2010. (AP Photo/Hoang Dinh Nam, Pool)
U.S. military personnel carry a coffin containing remains believed to be the U.S. servicemen, missing in action at the Vietnam War, during a repatriation ceremony with U.S. Secretary of State Hillary Rodham Clinton attended at the airport in Hanoi, Vietnam, Friday, July 23, 2010. (AP Photo/Kham, Pool)
U.S. Secretary of State Hillary Rodham Clinton waves before boarding a plane for departure back home following the 17th ASEAN Regional Forum meeting at the airport in Hanoi, Vietnam, Friday, July 23, 2010. (AP Photo/Kham, Pool)
North Korean Foreign Minister Park Ui Chun sits down next to his Chinese counterpart Yang Jiechi as they attend the plenary session of the ASEAN Regional Forum (ARF) in Hanoi, Vietnam, Friday, July 23, 2010. (AP Photo/Hoang Dinh Nam, Pool)
U.S. Secretary of State Hillary Rodham Clinton, left, delivers remarks after signing a framework agreement for the U.S. Presidents Emergency Plan for Aids Relief with Vietnam Minister of Justice Ha Hung Cuong, right, at Ngoc Lam Pagoda in Hanoi, Vietnam, Thursday, July, 22, 2010. (AP Photo/Paul J. Richards, Pool)
Hillary Clinton, U.S. secretary of state, arrives at Noi Bai International Airport in Hanoi, Vietnam, on Thursday, July 22, 2010. The U.S. said it will intensify sanctions against North Korea for sinking a South Korean warship, targeting members of Kim Jong Il's regime and the foreign banks that help sustain the country's weapon's industry. (Photographer: Nelson Ching/Bloomberg)
U.S. Secretary of State Hillary Rodham Clinton is greeted with flowers as she arrives at Hanoi Noi Bai International Airport to later meet with Vietnamese officials and attend the ASEAN-US Ministerial Meeting, Thursday, July 22, 2010, in Hanoi, Vietnam. (AP Photo/Paul J. Richards, Pool)
