8797
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 .
 organization: US Army; person: George Casey; geographical social political: Iraq; date: this past week; geographical social political: US; date: next year
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: US Army, George Casey, Iraq, this past week, US, next year 
Answer:
 organization: US Army; person: George Casey; geographical social political: Iraq; date: this past week; geographical social political: US; date: next year