35183
Once in Allied hands , it was used by B-17 Flying Fortress heavy bombers of the United States Army Air Force XII Bomber Command 97th Bombardment Group .
 United States Army 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:
 United States Army Air Force