quick tip: act 3 sceane 2 (the mission with the gas relesed in the end)
this only works on coop
make sure that before you move to the police cars you have a sniper for player one or two. on this mission after you kill all hostiles outside and inside the building you start in and the one you move to, there will be a pause in action. open the door and move right.move two the end of the hallway but dont head down the stairs,instead if you look you will see a window place your sniper here. move the non-sniper and team down the stairs and move too the windows. the sniper can look out the window he is at and shoot a machine gunner that shows up in the windows of the building you will storm. after that its no problem to take the building. the gunner is actully only really a problem on realistic. i can answer most questions on the campaign;) but no questions for online play.
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Helicopter boss walkthrough

I have a tip about the copter. The way I found to get around it was complicated I would immediately go to the big block and wait for the charecters to talk. While they talk an enemy spawns in the building to the left and another on the roof to the right I pick off the one that spawns to the left poking my head out aiming a good burst at him and hiding again if he didn't die I would do it again until he was dead then I would get the guy on the right before he finished getting down the rappel or using infared to see him easier then picking him off by the time I had killed them the charecters would usually be done talking then I would shoot poke my head out of the right of the block and the copter seemed to have trouble shooting me so I would shoot an entire light machinegun clip into it that would usually do the job then the dialogue box would open on the top and the girl would talk again. Watch the helicopter when it stops firing the machine gun. RUN around the corner and hide on one of the big blocks there. This part was a little more hectic then the last 3 enemies run out of the building I think they sent 2 waves of the 3 and the helicopter is shooting you with the machine gun again. Basically the same tactic with a small change keep popping and taking any cheap shots you can and if you see them toss a grenade at you try and check where it lands if it's close enough to kill you move to the other block yes that will put you in the open for a few seconds but at the same time the grenade is a guranteed death the enemies good aim is not a gurantee. If you have a choice you can grab a smoke it can help here but you can't see the copter through the smoke even with infared. After a you kill the second wave the copter stops shooting again if you have smokes throw one near you because another enemy or two come out of the building but your main objective here should be to get away from the copter before the big boom after the fence is hit this time and the last enemy or two is cleared the fence door near you on the far right is open so go in and run to the building all the enemies were coming from. Once inside this part is more fun then all the rest the copter is still annoying but now you have a checkpoint once you get inside the building. Now the enemies are coming from where you did if you have a light machine gun like I did you can mow them down but make sure the copter doesn't get you keep killing the enemies as they rush in lines towards you and listen to the girl tell you how much progress the missile has loaded once it's done a few seconds later the missile comes and kills the copter and all the enemies nearby die as well. Thats all for now.
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