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The date , May 29 , marks the anniversary of the creation of the United Nations Truce Supervision Organization ( UNTSO ) , in 1948 to monitor the ceasefire after the 1948 Arab-Israeli War , which was the first ever UN peacekeeping mission .
 United Nations Truce Supervision Organization
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 Nations Truce Supervision Organization