Found the answer to this question. The shoulder titles without "THE" embroidered on them were the pre-1946 issue. After the war the unit was converted to artillery, and wore the 54 LAA with the Royal Canadian Artillery post war embroidered shoulder title. In 1960, the unit, after being re-converted to infantry, had new shoulder titles approved which included the "THE" in the designation.
From Dress Instructions files, RG 24, LAC.
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Res ipsa loquitur
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