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US forces in the Yemeni harbor of Aden were elevated to delta immediately following the deadly October 12th terrorist bombing of US destroyer Cole .
 US, Yemeni, Aden, October 12th, US, Cole
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 US, Yemeni, Aden, October 12th, US, Cole