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The United States Air Force 's 693d Intelligence , Surveillance and Reconnaissance Group ( 693 ISRG ) is an intelligence unit located at Ramstein AB , Germany .
 United States Air Force, 693d, Surveillance, Reconnaissance
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, 693d, Surveillance, Reconnaissance