About the HUP and off white markings, could the poster be referring specifically to the AC4 on the front bumper? This might be the tactical marking for special role vehicle. As described at CanadianSoldiers, they were black with yellow writing:
'The signs were to measure 8 by 6 inches, be painted in black with a 5/8 inch yellow border, and have yellow characters measuring 3-1/2 inches by 2-1/2 inches.'
regards,
Jack
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