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During the Kennedy administration , the U.S. military advisory group in South Vietnam steadily increased , with McNamara 's concurrence , from 900 to 16,000 .
 Kennedy, U.S., South Vietnam, McNamara
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kennedy, U.S., South Vietnam, McNamara