After the part where u kill the Hunters,go through where they came from and go straight until you reach the wall in front of you,then turn right,and you should see two brown boxes with a small silver tin can on the top of the boxes,jump on to the brown boxes,then next to you there should be a ledge,jump on to that and then turn to your right,until you reach a wall,then turn right and you should see a dead marine,a dead jackal,and 2 dead grunts,the marine will only have 2 frag grenades,but if u look to your left and turn on your flashlight there should be a dead marine there wit a sniper rifle with two packs of ammo for it an smg and 2 frag grenades