tac5sniper

Me and two of my buddies make up a really good swatt force. But we have one problem. The area we play in is just a giant side hill covered in rocks. these rocks tend to be a good spot for snipers, its hard to come up behind and suicide to go strait at em. how could we effecively take the snipers out with out a grenade or rocket laucher...(we dont play with those items, not reliable enough). any help would be geatly appreciated we have a tourny comin up in a couple of weeks.