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He retained command until September 1938 , when he was appointed to the Admiralty as Deputy Chief of the Naval Staff , although he did not actually take up this post until December 1938 .
 Admiralty, Naval Staff
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Admiralty, Naval Staff