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The World War II 91st Bombardment Group ( Heavy ) was an Eighth Air Force B-17 Flying Fortress unit formed at MacDill Field , Florida and subsequently assigned to England .
 91st Bombardment Group, Eighth Air Force
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 91st Bombardment Group, Eighth Air Force