HIROSHIMA, JAPAN - AUGUST 06: Doves are released as a sign of peace during the Hiroshima Peace Memorial Ceremony at the Hiroshima Peace Memorial Park on the day of the 70th anniversary of the atomic bombing of Hiroshima on August 6, 2015 in Hiroshima, Japan. Japan marks the 70th anniversary of the first atomic bomb that was dropped by the United States on Hiroshima on August 6, 1945, killing an estimated number of 70,000 people instantly with many thousands more dying over the following years from the effects of radiation. Three days later another atomic bomb was dropped on Nagasaki, ending World War II. (Photo by Buddhika Weerasinghe/Getty Images)

HIROSHIMA, JAPAN - AUGUST 06:  Doves are released as a sign of peace during the Hiroshima Peace Memorial Ceremony at the Hiroshima Peace Memorial Park on the day of the 70th anniversary of the atomic bombing of Hiroshima on August 6, 2015 in Hiroshima, Japan. Japan marks the 70th anniversary of the first atomic bomb that was dropped by the United States on Hiroshima on August 6, 1945, killing an estimated number of 70,000 people instantly with many thousands more dying over the following years from the effects of radiation. Three days later another atomic bomb was dropped on Nagasaki, ending World War II.  (Photo by Buddhika Weerasinghe/Getty Images)