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It was the largest U.S. airborne operation since Operation Market Garden during World War II , the only major airborne operation of the Vietnam War , and one of the largest U.S. operations of the Southeast Asia n conflict .
 Vietnam, Southeast Asia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Vietnam, Southeast Asia