Ummm to get past any long distance sniper you'll nead a sniper rifle yourself some times you have to find these or are givin one in one particular part. What i tend to do is to save before the fight then find the sniper with my scope or bonoculars even if i get hurt then i re load and then kill him.

do anyone know secret code of pacific ***aut

I had trouble also. Just before you get to them there is a rifle in the water with the
large rock on the right. There are extra rounds behind the rock. First sniper in the
middle, then right, then left. Then two behind the island, one right side of river one on
left. Don't remember the order.