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He was one of 11 American pilots who flew with RAF Fighter Command between 10 July and 31 October 1940 , thereby qualifying for the Battle of Britain clasp to the 1939 – 45 campaign star .
 Fighter Command
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Fighter Command