Rooftop Finale

Upon reaching the roof, the Survivors find a makeshift defensive position in one of the main structures, and must use a radio to alert the helicopter to their presence. The pilot tells them to prepare themselves, and call again once they are ready. Once the second call is made, the helicopter will begin an approach, but the pilot warns that it will take some time to reach the hospital.

The Survivors must then hold out against waves of Infected which swarm their position, including several Special Infected and at least two Tanks. After fifteen minutes (with the pilot giving periodic updates), the helicopter finally arrives at the partly destroyed helipad, and the Survivors board it to make their escape. The Survivors may trigger an additional wave of zombies by shooting at the rotors of the helicopter as it lands.

With all the Survivors aboard, the helicopter flies off, going behind the hospital before coming around and passing above the camera. The camera fades to black, and the credits roll.

Tactic 1
OK, so Im not to happy about this but it is a sure fire way to get a 3x for survivers. This is my "sacrafice method". Ok when you first go up the ladder to get to the roof no one jump down from the high area you are on. Instead send 1 person to call for help. This person will probly die and you aren't completly safe from tanks or boomers but your nearly assured if your sacrafices gets to the radio that the 3 of you on the top will live. This works sufficiently better in Versus mode then it does in the regular campaign in my experience.