Asia Pacific An American's key role as Hiroshima commemorates atomic bombing (+video)

Steven Leeper oversees Hiroshima's commemoration of the Aug. 6, 1945, dropping of the atomic bomb. The US presence at the memorial ceremony has grown, with even President Truman's grandson in attendance this year.

Itsuo Inouye/AP

At 8:15 a.m. on every Aug. 6 since 1952, a moment of silence descends over the Peace Park in Hiroshima, Japan, to commemorate the estimated 200,000 victims of the first atomic bomb deployed in a wartime act of aggression.