Call yourself a car, and hopefully you have the Bodog Stampede by now. Get in it and take out the first set of guards at the front gate. Head farther in, still using the car, to the other side to take out the next group. You will have noticed you're now locked in. Wipe out all the guys on the ground. Some are armed with SAWs, so be careful. Now head on up to the roof to take out the sniper. Be doubly careful, as they seem to spawn quickly so you'll likely have to kill them a couple of times. Head down and let in your henchmen via the side gate. Now duck in the garage to the left and use your blind rage and take out the helicopters with your SAW. If, however, you don't have blind rage ready, right by the side of the side entrance there are some ship containers. Hide between them as the choppers won't be able to shoot you, or at least won't be able to get a very clean shot. They'll fly right over you, so attack them there. It's quite easy really, but note that there is health on the corner of the main building, up on the roof and in the garage if you need them.