UNSC Office of Naval Intelligence

The Office of Naval Intelligence often operates independently of other UNSC branches. At times it contravenes the law and UNSC protocol to complete top-secret missions. It appears to have an unusually large amount of military equipment for an intelligence service, and has a strong fleet presence. The Office of Naval Intelligence possesses a destroyer-sized prowler-class starship, UNSC Point of No Return, which is used as a command vessel and a secure conference location. ONI also maintains the UNSC's Prowler fleet, a major source of Covenant deployment intelligence, under the auspices of the UNSC Prowler Corps. ONI also manages field intelligence with units such as ONI Recon 111 liaising with mainstream UNSC military units.

Intra-ONI dynamics are often strained with intense competition amongst its own personnel. Agents operate under heavy scrutiny with mistakes often leading to demotion or death.