Oppo, What does this button do?

You don’t see the RCMP downtown much, it isn’t their jurisdiction but I work in a very high security building (US consulate building) so they are here often. But something on the Suburban caught my eye.

This suburban has a green button in the Chevy bowtie, I assume to open the hatch, but that doesn’t make any sense since you could just open it conventionally.

Can Oppo explain the function of this button? If I remember correctly Crown Vic Interceptors have a similar button in the centre of the dash to pop the trunk.