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Mountbatten served his final posting at the Admiralty as First Sea Lord and Chief of the Naval Staff from April 1955 to July 1959 , the position which his father had held some forty years before .
 Mountbatten, Admiralty
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mountbatten, Admiralty