I have seen similar setups on many CMPs. I was told that in Saskatchewan, it was mandatory for the right hand drives. There was a lever mounted inside on the roof to actuate the outer arm.
I have never seen one with Khaki paint on it, so I assume it was only installed in civilian use. Note that even today, the DND's vehicles in Canada are exempt from the requirements of the provincial governments with regards to safety inspections and requirements of the HTA. Many of the vehicles were not made to DOT standards either.
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