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He graduated from the U.S. Military Academy in 1923 and was an officer in the Corps of Engineers until leaving the army in 1929 .
 U.S. Military Academy, Corps of Engineers
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 U.S. Military Academy, Corps of Engineers