challenge: What is the origin of the 506th Infantry Regiment's nickname, 'Currahees'?
  
  A. The phrase 'three miles up, three miles down' used during training
  B. The name of their first commanding officer, Colonel Robert F. Sink
  C. The location of their training grounds, Camp Toccoa, Georgia
  D. The Cherokee word for 'Stand Alone', inspired by Currahee Mountain
  Answer: 