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The aim of this massive search and destroy operation was to eradicate the so-called " Iron Triangle " , an area located in close proximity to Saigon which had become a major stronghold of the communist National Liberation Front ( NLF ) or Viet Cong .
 Saigon
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Saigon