In the second mission (Arctic level) first phase where
you start with the hovertank, turn right slightly until you see
a pad/chopper. Go to it. When you get in front of it, turn right
slightly until you see a light bulb-shaped radar. Destroy it.
Go to where it used to be, then turn right slightly to see two
port-a-potties. Shoot them to see a man on the toilet, reading
a newspaper.