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Loring Air Force Base is a former census-designated place ( CDP ) in the town of Limestone , Maine in Aroostook County , Maine , United States .
 Limestone , Maine, Aroostook County, Maine, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Limestone , Maine, Aroostook County, Maine, United States