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troops from the u . s . army ' s 101st airborne division went to the site on friday , finding a number of large drums buried in bunkers .
 u . s, the u . s . army ' s 101st airborne division, u . s . army, troops from the u . s . army ' s 101st airborne division, the site, bunkers
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, the u . s . army ' s 101st airborne division, u . s . army, troops from the u . s . army ' s 101st airborne division, the site, bunkers