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USS Bouker No. 2 ( SP-1275 ) , later YT-30 , was a tug that served in the United States Navy from 1917 to 1921 .
 United States Navy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States Navy