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The Butt Report (born 18 August 1941) was a report prepared during World War II which revealed the widespread failure of bombers to deliver their payloads to the correct target. At the start of the war, RAF Bomber Command had no real means of determining the success of its operations. Crews would return with only their word as to the amount of damage caused or even if they had bombed the correct target. The Air Ministry demanded that a method of verifying these claims be developed and by 1941 cameras mounted under bombers, triggered by the bomb release, were being fitted. ==Report contents== The report was initiated by Lord Cherwell, a friend of Churchill and chief scientific advisor to the Cabinet. David Bensusan-Butt, a civil servant in the War Cabinet Secretariat and an assistant of Cherwell, was given the task of assessing 633 target photos and comparing them with crews' claims. The results, first circulated on 18 August 1941, were a shock to many, though not necessarily to those within the RAF who were already largely aware of the failure of crews to navigate to, identify, and bomb the targets. Postwar studies confirmed Butt's assessment showing that forty-nine percent of RAF Bomber Command's bombs dropped between May 1940 and May 1941 fell in open country.〔 Citing with footnote 34: Richards, ''Royal Air Force, 1939–1945'', vol. 1, ''At Odds'', 239.〕 As Butt did not include those aircraft that did not bomb because of equipment failure, enemy action, weather or failed to find the target area only about five per cent of bombers setting out bombed within five miles of their target. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Butt Report」の詳細全文を読む スポンサード リンク
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