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.