Metal Gear Solid V: The Phantom Pain Walkthrough – Mission 29: Metallic Archaea

A launcher will be useful in this situation, and you’ll need supply drops to complete the fight. As soon as the battle begins, break left toward the fence past the red-and-white striped tower. Don’t worry about Code Talker; he’ll be safer with you gone. Run to the break in the fence and position yourself just behind it.

Your view will become fuzzy as you reach the edge of the mission arena. Stay within a few meters of the fence to the right of the gap. The Skulls will follow you here, keeping Code Talker out of danger, but the zombies are likely to pose a threat.

Using the gap in the fence for cover, begin sniping the Skulls with your rocket launcher. Stay mobile and continue using the fence to block their main attacks. Focus on one or two Skulls at a time, and ensure that you constantly call in supply drops on your side of the fence.

Since you're at the edge of the map, the Skulls can't surround you, allowing you to take them down fairly easily if you stay quick on your feet. Once all the Skulls are defeated, the zombies will also drop.