Hidden RPG and light machine gun on Patriotic Defense
Swap characters to Jones, who is defending the rear. You will see a tunnel to the left. Go in it and, when the tunnel ends, keep going into the next one. When an Iraqi appears, shoot him then make a right turn. You can go either straight or left. Go to the left to find a hidden RPG and light machine gun against the wall you are facing when you come out. If you went in the correct direction, there should also be a truck at that location.