challenge: Why did the Canadian 450 Tactical Helicopter Squadron initially receive the '450' designation?
  
  A. Due to an administrative error, as the Canadian 400 series squadrons had been numbered between 400 and 449
  B. As a tribute to the Australian No. 450 Squadron RAAF
  C. As a result of a merger between the RCAF and RAAF
  D. Because the squadron was originally formed as part of the RAAF during World War II
  Answer: 