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US Army General George Casey the head of coalition forces in Iraq talking this past week about the possible start of US troop withdrawals next year .
 US Army, George Casey, Iraq, this past week, US, next year
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 US Army, George Casey, Iraq, this past week, US, next year