I wouldn't call it cover or off the map, but a case where out of the enemy's range and that only goes for the tank. As soon as you come out to kill the three guards, straight ahead on the left. You're not even ascending very much.
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OK, well I was talking about cover. So... Good story, bro.
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You glide up into a rock overhang. Everything shoots at you but once the tank is out you can snipe him with no shots coming back. I don't class it as off the map. It is a cheap way of killing the tank but thats it, everything else can and will shoot back.