The CF Airforce (and likely the RCAF before) indeed used yellow airfield M152's. While there is a 439 Sqn which dates from WWII, I couldn't say if 439 numbers on the side of your truck are related. I regularly admired a yellow M152 at Namao (Edmonton Alta) in the 70's. It was in simply supurb condition kept parked in a heated breezeway. Probably a crash truck, though I don't remember if there were markings on the truck I do remember there was a yellow whoopie light on the top so it could drive out on the airstrip.
Cheers JD
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Here we go in bull low,
stuck in four wheel drive....
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