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As a young boy , he was evacuated from London during the rocket attack of 1945 , to the countryside near a U.S. military airfield , where an American aircrew took him around their B-17 Fortress bomber .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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