Hey guys, just thought I'd share this with you. How to get out of the map on the campaign mission Heat. As far as I know this is the only way out of the map:
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1) Pick up an RPG from the place where I do in the video
2) Do an RPG jump from the fence to the door
3) Do a crouch jump from the door to the other door
4) Finally do an RPG jump from the door to the roof and you're out of the map