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World War I and postwar period He served as Commandant of the Washington Navy Yard and Superintendent of the Naval Gun Factory from 1915 to early 1917 when he was appointed the Navy Department representative in a special mission under Elihu Root being sent to Russia .
 Washington Navy Yard, Naval Gun Factory, Elihu Root, Russia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Washington Navy Yard, Naval Gun Factory, Elihu Root, Russia