Planetary Security Intelligence

A Planetary Security Intelligence, also known as PSI for short, is a type of artificial intelligence construct in service with the UNSC.

Usage
One such PSI is Loki, who served on the. They are generally kept secret by, in one case, swapping positions with another AI. They help conduct defense operations and evacuations in the event of an invasion of a UNSC colony by Covenant forces, an example of such being the first Covenant invasion of Harvest.

List of appearances

 * Halo: Contact Harvest