How do you kill the helicopter in all ghilied up in call of duty 4 modernwarfare?

In the "All Ghillied Up" mission of Call of Duty 4: Modern Warfare, you can kill the helicopter by using a Stinger missile. After navigating the area and avoiding enemy detection, you’ll reach a spot with a Stinger launcher positioned on a rooftop. Wait for the helicopter to hover above and then take aim to fire the missile, ensuring you lead your shot slightly to hit it successfully.