Strategy One: (Makes this level easy)
The key to this map is the play conservative with your vehicles. If someone can fly the Apache, then this map will be very easy. There isn't truly a base strategy for this map. Always play as engineers. If you take the Apache route, there should be two in the Apache. And two people in the tank. Keep these vehicles protected as much as you can. If your Apache starts to smoke, fly away! The Apache is very powerful against infantry units, but not that good against ground vehicles. Their purpose is to kill infantry and the helicopters that spawn. The tank is to take out other tanks and to take over the bases.
Strategy Two: (A little harder)
Have two people take the tank and two people be engineers with tracer darts. Have the tank take out enemies and the engineers take out any major vehicles like Helicopters and Tanks.