End of World War II in Asia
Second, and more powerful plutonium implosion atomic bomb, Fat Man, is dropped on Nagasaki from a different "Silverplate" B-29 named "Bockscar", flown by Maj. Charles Sweeney (Atomic bombing of Nagasaki)
William Penney, Baron Penney
Along with RAF Group Captain Leonard Cheshire, he accompanied the American Team to Tinian Island from which the Hiroshima and Nagasaki missions were flown. On 9 August 1945 he witnessed the bombing of Nagasaki. The US authorities had controversially stopped them seeing the Hiroshima detonation, but at the last minute Penney and Cheshire were granted permission to fly in the B-29 "Big Stink", one of the observation planes that accompanied the Nagasaki weapon delivery bomber "Bockscar". Due to the belated permission, "Big Stink" missed its rendezvous with the bomber at Nagasaki. They saw the Nagasaki detonation from the air at a distance. As the leading expert on the effects of nuclear weapons, Penney was a member of the team of scientists and military analysts who entered Hiroshima and Nagasaki following the Japanese surrender on 15 August 1945 to assess the effects of nuclear weapons.