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Military career After eight months as a cavalryman , Gilsher transferred to the Imperial Russian Air Force on 29 August 1915 .
 person: Gilsher; organization: Imperial Russian Air Force
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Gilsher; organization: Imperial Russian Air Force