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As junior officers , they wear one gold band along the edge of the visor of their service cap s. Lieutenant-commanders of the Naval Operations Branch wear the officer 's pattern of the branch cap badge : an anchor on a black oval , surrounded by a wreath of maple leaves at the sides and base of the oval , the whole surmounted by the St Edward 's Crown .
 None
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:  
Answer:
 None