We need BC2 Vehicle anti Missile/Rocket Alarm

If you played Bad Company 2, you'll know what I'm talking about, it's an Alarm that starts playing once a missile/rocket is coming toward you. It's very useful when shot with Tow missiles.

Right now the Tow missile is a silent killer for Air vehicles, you die instantly without any warning whatsoever.

It would be nice to have this Alarm as a custom equipment for Air vehicles.