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The operation was notable in that it was a sizable , combined U.S. Marine and Vietnamese Marine amphibious operation and it was the last Special Landing Force ( SLF ) amphibious landing to take place beyond the boundaries of I Corps .
 Marine, Vietnamese Marine, Corps
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Marine, Vietnamese Marine, Corps