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Specialising in navigation and air control , Davidson saw service in the Atlantic and Pacific Ocean s , as well as undertaking various staff and headquarters appointments before taking command of HMCS Kootenay in 1988 .
 Davidson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Davidson