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He was a quadruple ace , being credited with 20 victories during World War I. World War I service Ross originally served in the Royal Flying Corps , having joined in August 1917 .
 Ross, Royal Flying Corps
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ross, Royal Flying Corps