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M4A3E8 " Easy Eight " variant of Sherman tanks , dating back to World War II , had been retired from service by the Republic of Korea Army , and the backbone of the South Korean armor was formed up of M47 and M48 Patton tanks .
 organization: Republic of Korea Army
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Republic of Korea Army