UEG Secret Intelligence Service

The Secret Intelligence Service, also called MI5, was the civilian intelligence agency of the Unified Earth Government tasked with law enforcement and internal security duties, most notably counter-terrorism and combating organized crime, on Earth and the UEG colonial holdings. It was nowhere near as powerful as its United Nations Space Command rival agency, the Office of Naval Intelligence, officially the MI5's military equivalent. Directly subordinated to the President of the UEG, the MI5 was a counterpart of the ONI but generally possessed less political clout and firepower.

The Secret Intelligence Service was divided into multiple sections, or branches.