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History The site was established in 1957 as a manned Gap Filler radar station , built by the United States Air Force , under operational control of Cartwright Air Station and part of the Pinetree Line of Ground-Control Intercept ( GCI ) radar sites .
 United States 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:
 United States Air Force