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In 1940 , during the Second World War , an airfield was built to the west of Kingston to serve as a training station for the Royal Air Force 's No. 31 Service Flying Training School ( SFTS ) .
 Kingston, Royal 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:
 Kingston, Royal Air Force