299553
Overview Under the " Total Force " concept , Colorado Air National Guard units are considered to be Air Reserve Components ( ARC ) of the United States Air Force ( USAF ) .
 Colorado, Guard, 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:
 Colorado, Guard, United States Air Force