Although there are lots of soldiers to kill don't get too giddy on the trigger for fear of killing the Gallimimus. Keep an eye on the dinosaur counter as if this falls too low your mission has failed. I find the Uzi is the weapon to use. When enemies hide behind rocks, the shotgun is the best weapon.. The spread of the pellets gives you a wider range. Watch out for mines on the floor. These can be shot but it's just as easy to jump them. Make use of the ability to crouch and shoot especially while in craters. When the cage is coming towards you, pump off a few shots with the shotgun and then duck, as the cage moves away chase it firing quickly. Then it's the helicopter. The best advice is go mad with the shotgun. Even when the helicopter is firing at you, still try to get off a few shots.