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The U . S . forces zeroing in on Baghdad _ the 1st Marine Division from the east and the Army ' s 3rd Mechanized Infantry Division _ are trained in urban warfare .
 U . S, Baghdad, the Army, The U . S . forces zeroing in on Baghdad _ the 1st Marine Division from the east and the Army ' s 3rd Mechanized Infantry Division, the 1st Marine Division from the east, the Army ' s 3rd Mechanized Infantry Division
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 U . S, Baghdad, the Army, The U . S . forces zeroing in on Baghdad _ the 1st Marine Division from the east and the Army ' s 3rd Mechanized Infantry Division, the 1st Marine Division from the east, the Army ' s 3rd Mechanized Infantry Division