Nursing orderly was made a trade in 1942. He wasn't a medic per se but more of a nurse who aided wounded in static medical facilities and transported patients. He should have worn a T trade badge but as with some of these badges, if he was trained by the Brits, he may have put up their badge and not the Canadian "T".
The badge illustrated is the 1956 pattern Medical Assistant Group 1 Trade Badge. This group of trades included Medical Assistant, Nursing Assistant, Laboratory Assistant, Radiographer,Hygiene Assistant, and Instrument Mechanic Surgical. There may have been more trades covered by this badge.