No. 440 "City of Ottawa" Transport Squadron (Vampire) is a unit of the Canadian Forces under the Royal Canadian Air Force. It is part of 17 Wing and Joint Task Force North located in Yellowknife, Northwest Territories. Based at Yellowknife Airport and operating throughout Northern Canada, the unit's primary role is to provide support to the Canadian Forces, including the Canadian Rangers and the Royal Canadian Air Cadets, with search and rescue as a secondary role. The squadron operates four CC-138 DHC-6 Twin Otter aircraft that can flown on tundra tires, skis or floats.