The Office of Naval Intelligence, is the intelligence service of the UNSC Navy. Overtly, the agency is merely the information gathering and analysis division of the UNSC Naval Command. In reality, the operations of the Office of Naval Intelligence are far broader than simple intelligence gathering.
ONI has become known for their preeminent role in the acquisition and leveraging of military intelligence. The agency is widely known for using subterfuge, deception, and manipulation in defense of humanityin order to accomplish its goals. Additionally, the Office of Naval Intelligence employs numerous special projects, such as the SPARTAN programs, Project: MJOLNIR, and the investigation of Forerunner sites—the most notable of which is Trevelyan.