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The bucher aircraft tractor is only used by the Swiss Air Force , the only civil customer is JU-AIR for her Junkers 52 on the military Airfield Dübendorf .
 Swiss Air Force
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Swiss Air Force