21 Aerospace Control and Warning Squadron

21 Aerospace Control & Warning Squadron is a Royal Canadian Air Force unit based at 22 Wing/CFB North Bay. It is the operational air defence unit for the Canadian NORAD Region.

With its complement of 185 personnel, 21 Aerospace Control & Warning Squadron maintains air sovereignty over Canadian airspace, monitors Canada's surveillance assets and controls assigned military aircraft, such as CF-18 interceptors. It coordinates with outside agencies to identify air traffic (over 200,000 flights a year), provides control of special air sovereignty incidents, assist law enforcement agencies with cases of suspected smuggling of illegal drugs via air into North America and supports international defense and peacekeeping commitments.