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He was sworn in on May 19 , 2009 , and held a ceremonial swearing in at Washington Navy Yard on June 18 , 2009 , where he was re-sworn in by the Secretary of Defense Robert Gates .
 location: Washington Navy Yard; person: Robert Gates
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 location: Washington Navy Yard; person: Robert Gates