In this Aug. 6, 1945, file photo, survivors of the first atomic bomb ever used in warfare are seen as they await emergency medical treatment in Hiroshima, Japan. The Associated Press
In this Aug. 6, 1945, photo, smoke rises around 20,000 feet above Hiroshima after the first atomic bomb was dropped. The Associated Press
This operations order for dropping an atomic bomb on Hiroshima, dated Aug. 5, 1945, was carried on the Enola Gay in the flight log of Jacob Beser, the radar and electronics specialist. Museum of World War II Boston via AP
In this Aug. 8, 1945, photo, soldiers and civilians walk through the grim remains of Hiroshima, two days after the atomic bomb explosion. The building on left with columned facade was the Hiroshima Bank. To its right, with arched front entrance, was the Sumitomo Bank. The Associated Press
Shortly after the first atomic bomb ever used in warfare was dropped by the United States over the Japanese city of Hiroshima, survivors are seen as they receive emergency treatment by military medics. The Associated Press
This undated photo shows items carried by Theodore J. Van Kirk, the navigator aboard the Enola Gay on the mission to Hiroshima. Museum of World War II Boston via AP
In this Sept. 5, 1945, file photo, the skeleton of a Catholic Church, foreground, and an unidentified building, center, are all that remaining the blast center area after the atomic bomb of Hiroshima, Japan. The Associated Press
A woman prays for the victims of the atomic bombing at the Hiroshima Peace Memorial Park in Hiroshima, western Japan early Thursday, Aug. 6, 2015. Japan marked the 70th anniversary of the atomic bombing of Hiroshima. (Kyodo Photo via AP) JAPAN OUT, MANDATORY CREDIT
A woman gets teary-eyed as she prays for the victims of the atomic bombing at the Hiroshima Peace Memorial Park in Hiroshima, western Japan early Thursday, Aug. 6, 2015. Japan is marking the 70th anniversary of the atomic bombing of Hiroshima. (Kyodo Photo via AP) JAPAN OUT, MANDATORY CREDIT
Children stage a die-in in front of the Atomic Bomb Dome in Hiroshima, western Japan at 8:15am, the time atomic bomb exploded over the city, on the 70th anniversary of the atomic bombing of Hiroshima, western Japan Thursday, Aug. 6, 2015. (Kyodo Photo via AP) JAPAN OUT, MANDATORY CREDIT
A man prays for the atomic bomb victims in front of the cenotaph at the Hiroshima Peace Memorial Park in Hiroshima, western Japan, early Thursday, Aug. 6, 2015. Japan marked the 70th anniversary of the atomic bombing on Hiroshima. (AP Photo/Koji Ueda)
Doves fly over the cenotaph dedicated to the victims of the atomic bombing at the Hiroshima Peace Memorial Park during the ceremony to mark the 70th anniversary of the bombing.
In this Sept. 4, 1945 photo, the remains of a factory are seen, upper left, in Nagasaki, gutted by the Aug. 9 atomic bombing there. The Associated Press
In this Sept. 8, 1945, photo, two people walk on a cleared path through the destruction resulting from the Aug. 6 detonation of the first atomic bomb in Hiroshima. AP Photo/U.S. Air Force
In this Aug. 8, 1945 fphoto, the shell of a building stands amid acres of rubble in Hiroshima. The Associated Press
Paper lanterns float along the Motoyasu River in front of the illuminated Atomic Bomb Dome memorial in Hiroshima on Thursday. The Associated Press
A boy offers a prayer Thursday after releasing a paper lantern into the Motoyasu River where hundreds of thousands of atomic bombing victims died. The Associated Press
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