Formed as the School of Army Co-operation at Rockcliffe, Ontario on October 22, 1941 with Lysander and Harvard aircraft, and redesignated No. 123 (Army Co-operation Training) Squadron on January 15, 1942, the unit provided training in close support and reconnaissance for Canadian Troops. Selected in the fall of 1943 as one of six home fighter units for overseas duty, it ws redesignated No. 439 (Fighter Bomber) Squadron at Wellingore, Lincolnshire, England on January 1, 1944.
Operational/Non-Operational Flying Hours: 194/10,098