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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 .
 Royal Marines, Chatham
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Royal Marines, Chatham