 6 Group, Royal Canadian Air Force (RCAF).The airfield also hosted No 1664 (Royal Canadian Air Force) Heavy Conversion Unit RAF starting from 10 May 1943 which trained new pilots to fly the new heavy bombers using the Mk II and the Mk IV Halifax before leaving on 7 December 1943.When three days later on the tenth 431 Squadron RCAF began using the airfield with the Halifax Mks V and III and the Avro Lancaster Mk.X before leaving on 7 June 1945 going to Canada.