You have to HOLD DOWN THE SHOOT BUTTON AIMING AT SOMETHIN (it has to turn green)

The rocket homing missiles can be fired from the rocket launchers and similar launching systems.

I have no idea how to use this

Ok?

It's an lock on Missile that locks on to a target at a certain range and once fired follows the target automatically. Have fun: )

What's this used in

I haven't the slightest