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It was reformed on 4 December 1921 , as the 105th Observation Squadron , and is one of the 29 original National Guard Observation Squadrons of the United States Army National Guard formed before World War II .
 105th Observation Squadron, Guard Observation, United States Army National 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:
 105th Observation Squadron, Guard Observation, United States Army National Guard