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He also began writing a novel in a new style , using first-person narration , but abandoned work on it when he was commissioned into the Royal Marines in December and entered training at Chatham naval base .
 organization: Royal Marines; location: Chatham
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 organization: Royal Marines; location: Chatham