Explanation:

- Battery: This is the correct answer. It refers to a group of guns or missile launchers that are operated together at a single location. It's often used in military contexts to describe a unit of artillery.

- Cemetery: This is a place where dead bodies are buried. It has no connection to a group of guns or missile launchers.

- Skittery: This is not a recognized English word relevant to the context. It seems unrelated to any concept of artillery or missile launchers.

- Psaltery: This is a musical instrument, specifically a stringed instrument. It’s not related to artillery or missile launchers.