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Development and design In 1913 , the British War Office asked the engineering company Sir W G Armstrong Whitworth & Co Ltd to manufacture aeroplanes and aircraft engines for the Army , and in response to that request , Armstrong Whitworth set up an aircraft department , hiring the Dutch designer Frederick Koolhoven , formerly chief engineer of British Deperdussin as chief designer .
 War Office, Sir W G Armstrong Whitworth & Co Ltd, Armstrong Whitworth, Dutch, Frederick Koolhoven
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 War Office, Sir W G Armstrong Whitworth & Co Ltd, Armstrong Whitworth, Dutch, Frederick Koolhoven