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Iraqis who initially were cautious when U . S . forces arrived in Najaf ended cheering them on , shaking their hands and patting their backs .
 U . S, Najaf, Iraqis who initially were cautious when U . S . forces arrived in Najaf, who, U . S . forces, them, their, their
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, Najaf, Iraqis who initially were cautious when U . S . forces arrived in Najaf, who, U . S . forces, them, their, their