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The service number indicates this man joined up at the Number 12 District Depot in Regina, Saskatchewan.
The following quote was taken from
http://rcasc.org/rcasc_hist_breif.html
"Meanwhile, in North-West Europe, the 3rd Canadian Infantry Division, with 2nd Canadian Armoured Brigade under command, landed on D Day, 6 June 1944, as part of 1 British Corps. The 2nd Canadian Corps soon became operational in France followed by 1st Canadian Army Headquarters. With them came many RCASC units such as: 1st Canadian Army Transport Column Headquarters with 45, 47, 63 and 64 Transport Companies; 1st Canadian Army Troops Headquarters with 35 and 36 Army Troops Composite Companies; 2nd Canadian General Transport Column with 65, 66 and 69 Transportation Companies and No.s 85 and 86 Bridging Companies."
This seems to indicate the man was probably a driver with No. 69 General Transport Column.