The Test Flight was expanded into the RCAF Test and Development Establishment in November 1940 to meet the demands of the Second World War; it was renamed to the Experimental and Proving Establishment in 1946.
Additional units included the Winter Experimental Establishment at Edmonton, and the RCAF (National Research Council) Unit at Arnprior.
In 1957, CEPE headquarters moved from Rockcliffe to RCAF Station Uplands; jet aircraft testing required a longer runway.
[2] In 1954, CEPE's Air Armament Evaluation Detachment (AAED) was created at Cold Lake.
[4] 448 Squadron was formally redesignated as Aerospace Engineering Test Establishment, Cold Lake in 1971.