With Update 1.2, I have added my AI Control Switch system to the mod. The system is improved over the previous iterations I used on my other maps. The main improvement is ease of use. The switches all feature custom interaction text, which will save you time with coming back and forth from this thread to learn what each of them controls. Switches also now feature different colored lighting based on the faction they belong to. I will still give a brief description below on what you can expect from them.

All buttons that control the AI are located in the central structure. (The long hallway.) The Covenant switches are towards their side, and the UNSC are vice versa. There is also a larger switch in the middle with a red light. This is a master killswitch. Pressing this will remove all AI from the map, and toggle all individual squad control switches off. You will need to reactivate them individually to begin the spawning again.

UNSC Switches:

A flashing green light indicates the corresponding squad is deactivated and ready for you to enable them. A solid yellow light indicates the squad is activated and in use. When approaching a button, custom interaction text appears letting you know which AI squad you are about to enable/disable. Ground based infantry, Vehicles, and Air Support buttons are all grouped in their own sections of the UNSC side of the long hallway.

Covenant Switches:

A flashing purple light indicates the corresponding squad is deactivated and ready for you to enable them. A solid reddish pink light indicates the squad is currently enabled and in use. The same guidelines and custom information text described above also applies to all Covenant Switches. Infantry, Ground Vehicle, and Air Support controllers are all grouped in their own section.

Quick Response Switches:

In each of the bases, there is one additional controller. These place a group of AI on map immediately when pressed. Press the button once, and your AI will appear nearby. After all AI are lost, the switch will automatically revert back to OFF. You are now free to use the switch again.