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In 1945 he joined the army and was commissioned 2nd lieutenant in the Royal Armoured Corps in 1946 , and was promoted to lieutenant in November 1947 .
 organization: Royal Armoured Corps
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: Royal Armoured Corps 
Answer:
 organization: Royal Armoured Corps