Actually that didn't really work well. The choppers still attacked them when they were in the town. I guess the soldiers with RPGs were shooting at the tanks and stuff. I dunno but they still kept dieing before they were even suppose to be part of the mission.
So I decided to reduce the number of tanks attacking and send the choppers off after we capture the base. I started the trucks and tanks all the way on the other side of the island (well, not quite, but far enough away that the choppers are gone before they get to the base to attack). Now, there are 2 problems. 1) Sometimes we clear the base really quickly, so we end up waiting up to 5 minutes for the enemies to come, and 2) Sometimes (actually this has been happening a lot of the time) the trucks/tanks will activate the trigger, then they will drive out of it or something and it will end the mission, thinking that they are dead.
I'm going to zip up the mission and put it on here, maybe someone else can look at it. Everything else runs fine except for this part. Well, at the beginning the camera is suppose to go all the way around the base but it stops about half way and jerks back and forth a few times before ending...
So if anyone can help me, I'll appriciate it.
*EDIT* This mission takes place on the Rebuilt Kolgujey Map. I'm pretty sure that's the only addon that you will need for it.