U.S. Ambassador to Japan John Roos, looking upward, takes part in the 65th anniversary of the world's first atomic bombing in the Hiroshima Peace Memorial Park in Hiroshima, western Japan, Friday, Aug. 6, 2010. The United States sent its first ever delegation to the ceremony marking the anniversary of the attacks. (AP Photo/Kyodo News, Shigeyuki Inakuma)

Photo by: Shigeyuki Inakuma

U.S. Ambassador to Japan John Roos, looking upward, takes part in the 65th anniversary of the world's first atomic bombing in the Hiroshima Peace Memorial Park in Hiroshima, western Japan, Friday, Aug. 6, 2010. The United States sent its first ever delegation to the ceremony marking the anniversary of the attacks. (AP Photo/Kyodo News, Shigeyuki Inakuma)