24045
A series of air attacks lasting for more than three weeks reached its peak on 17 April 1945 , when United States Army Air Forces planes bombed the branch arsenal office and the train station .
 United States Army Air Forces
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 Forces