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CROWLEY In the spring of 1970 , a squad of U . S . soldiers spotted a small unit of Viet Cong that had been circling for days .
 geographical social political: U . S; organization: a small unit of Viet Cong that had been circling for days; person: a squad of U . S . soldiers; person: U . S . soldiers; person: Viet Cong that had been circling for days; person: that
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 geographical social political: U . S; organization: a small unit of Viet Cong that had been circling for days; person: a squad of U . S . soldiers; person: U . S . soldiers; person: Viet Cong that had been circling for days; person: that