When in multi-player mode choose the level called FROSTBITE. 
Then go across the bridge with the bodyarmor and turn until 
you are facing the wall, walk and drop down. facing the cave turn 
left. There should be a small cave go in and keep walking there 
will be two boxes one an A.S.S ESSENTIAL the other some ammo. 
Continue up till you reach flat land turn right and you will be 
at a lookout point. To get down just run and drop.