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Percy Wilfred Northcroft ( August 31 , 1886 – December 20 , 1967 ) was an American football player and Naval officer .
 Percy, Northcroft, Naval
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Percy, Northcroft, Naval