When playing online in xbox live, load a game in LVU Campus and if on Bravo Team head to the roof of where you spawn. Now when heading through the stairs to the roof if you head to your left and go towards a square gray box. It looks like a electrical box well go to it and your going to see another small gray box on the side. Your going to need two teammates one is going to hold the left trigger against that grey box and while holding the trigger you peer out to your right still taking cover. When looking the your right you hold the trigger hold the left analog stick right and hold a button then let go at the same time. You are now on the vent box and from here look left and have teammate crouch down on the ground inbetween the roof ledge and you now walk across on him and your on the roof of your base this is a perfect killing spot.