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During World War II , " Smoky Hill Army Airfield " ( AAF ) became significantly historic as it was in the first group United States Army Air Forces B-29 Superfortress bases for initial training on the aircraft in the summer of 1943 .
 United States Army Air Forces
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States Army Air Forces