When you are on the mission where you have to carry your captain (when you are in the Ghillie Suits),you will find abandoned swimming pool with some rabid dogs at the bottom. Do not kill them. Just run around the edge and do not fall in. When you drop your captain off behind the Ferris wheel and both of you get into position, there will be a patrol after you. When your captain tells you to open fire with your sniper rifle, shoot anyone on the left side, closest to the building with the pool in it. Everyone will hit the deck after one of their teammates dies. The dogs will sense danger, jump out of the window, and start attacking the soldiers. This is helpful as at least four or five of the soldiers die. This also saves ammunition.