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He later served as the operations officer of a fighter-interceptor squadron in Knoxville , Tennessee , before being promoted to commander of a fighter squadron at Kadena Air Base in Okinawa , Japan .
 Knoxville, Tennessee, Kadena Air Base, Okinawa, Japan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Knoxville, Tennessee, Kadena Air Base, Okinawa, Japan