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History Unit was formed as 113th Aero Squadron in August 1917 at Kelly Field , Texas an then assigned as an aviation unit with the Pennsylvania National Guard , however apparently performed support duties as a supply unit .
 113th, Squadron, Guard
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 113th, Squadron, Guard