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The Imperial Japanese Army mobilized 1,780 middle school boys aged 14 – 17 years into front-line-service .
 Imperial Japanese Army
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Imperial Japanese Army