Just had a quick gander on it.
Basically on the Nod Harvester side where you can go up the infantry path to the bridge, you can jump on the rocks and then kinda snipe behind a rock and you can also get stuck within some rocks if you walk all the way to the edge.
Once you jump on the rock, with a little crouch action to secure yourself, you can just get the top and make your way to the area, an area which the other side of the infantry path doesn't have.