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January Operation Deckhouse Five was conducted by the United States Marine Corps and South Vietnamese Marine Corps forces along the Mekong River Delta , as part of the Vietnam War .
 United States Marine Corps, South Vietnamese Marine Corps, Vietnam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 United States Marine Corps, South Vietnamese Marine Corps, Vietnam