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Gaddis enlisted as a private in Captain Robert Bell ’s company , in the 13th Virginia Regiment under Lieutenant Colonel John Gibson .
 Gaddis, 13th Virginia Regiment, Colonel John Gibson
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Gaddis, 13th Virginia Regiment, Colonel John Gibson