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When the United States entered World War I , he took command of Division 1 , U.S. Atlantic Fleet , with Alabama ( BB-8 ) as flagship April 5 , 1917 , and was appointed Rear Admiral August 31 .
 U.S. Atlantic Fleet
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. Atlantic Fleet