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Up next , pitching great Roger Clemens talks about his experiences meeting U . S . service members in Afghanistan and the Persian Gulf .
 U . S, Afghanistan, pitching great Roger Clemens, his, U . S . service members in Afghanistan and the Persian Gulf, the Persian Gulf
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, Afghanistan, pitching great Roger Clemens, his, U . S . service members in Afghanistan and the Persian Gulf, the Persian Gulf