A helicopter door gunner hones in his skills during a training exercise by shooting down an unmanned drone over the ocean.

Door gunners aren't always amazing marksmen, but when you're shooting a machine gun you don't have to be. Even machine gunners who don't have dead-eye aim need to practice though, and that's what's happening in this video.

If you've ever wondered how helicopter door gunners practiced their craft, now you know. They go out over the ocean and shoot down unmanned drones that are flying near their helicopter.