The two governments hope Obama's tour of Hiroshima will highlight a new level of reconciliation and closer ties between the former enemies.Īt 8:15am on 6 August 1945, a 4,400kg nuclear bomb nicknamed Little Boy was dropped on Hiroshima by an American B-29 Superfortress bomber, the Enola Gay, flown by Colonel Paul Tibbets. Barack Obama has become the first sitting US president to visit Hiroshima, site of the world's first atomic bombing.