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From 1953 until 1955 , Westall served in the British Army as a Lance Corporal in the Royal Corps of Signals .
 Westall, Royal Corps of Signals
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Westall, Royal Corps of Signals