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This article describes about the intelligence branch of the UNSC. For the music, see The Office of Naval Intelligence (song).

The Office of Naval Intelligence (ONI) (pronounced as oʊni), is the intelligence service branch of the UNSC Navy. Its formal name is the UNSC Military Intelligence Division.[4] Although it is under the jurisdiction of the Navy, ONI had a liason with the HIGHCOM Security Committee.[5]

Admiral Margaret Parangosky was the Commander-in-Chief of ONI until some point before 2555 at the latest, at which time her protege Serin Osman replaced her.[6]


Early HistoryEdit

The Office of Naval Intelligence was founded in 2178.[1][2]

One of the earliest known projects undertaken by ONI was in 2321. This project, dubbed ORION, was an attempt to increase the effectiveness of Colonial Military Administration soldiers. However this initial run was eventually postponed.[7]


In 2491, the Carver Findings were released and ONI began to use it as their approach to the Insurrectionists.[8]

Human-Covenant WarEdit

Main article: Human-Covenant war

At the beginning of the war, some ONI analysts believed the Covenant may have visited Earth in the past. Part of this was due to to the meter and a half tall Unggoy the Covenant employed. As such, the Covenant received the nickname "LGM" or "Little Green Men".[9]

Over the course of the war, ONI absorbed or eliminated most competing civilian and military espionage services.[10]


Following the war, the Office of Naval Intelligence had become the primary intelligence service of the UEG with nearly uncontested power in this field.[10]

As of 2555, Admiral Margaret Parangosky was replaced with Admiral Serin Osman as Commander-in-Chief.[6]

During The Reclamation, ONI teams sanitized data on Earth.[11] As well, CINCONI Serin Osman went into hiding, along with Fleet Admiral Terrence Hood.[12]


It is a division of the UNSC Navy that is responsible for counter-espionage and propaganda and intelligence matters across the UNSC. As such, ONI employs members of other military branches, and even civilians, to complete the Division's shadowy work.

Many of its functions and subdivisions, like the Beta-5 Division and the SPARTAN-III Program, are enigmatic, and its personnel are regarded as mysteries by mainstream naval officers. ONI personnel, especially officers, are often referred to as "spooks."


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.

Agents appear to enjoy significant latitude in the discharge of their duties, often violating moral boundaries or acquiring vast amounts of UNSC resources to achieve their ends.


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

Known ONI BranchesEdit


It appears to have an unusually large amount of military equipment for an intelligence service, and has a strong fleet presence.


ONI also manages field intelligence with units such as ONI Recon 111 liaising with mainstream UNSC military units.[13]

List of UnitsEdit


ONI operated a number of starships. ONI maintains the UNSC's Prowler fleet, under the auspices of the UNSC Prowler Corps.[14]

List of Aerospace AssetsEdit




Each ONI Section operates their own personnel.

  • For ONI Section Zero personnel, See here.
  • For ONI Section One personnel, See here.
  • For ONI Section Two personnel, See here.
  • For ONI Section Three personnel, See here.

Unknown SectionEdit


Main article: ONI Facilities

The Office of Naval Intelligence operates a number of different facilities throughout human space on both Inner and Outer Colonies.

Some facilities were guarded by specialized security, however these forces were under the jurisdiction of Naval Special Warfare.[15]





  1. 1.0 1.1 Halo 4: The Essential Visual Guide - Page 229
  2. 2.0 2.1 Halo Waypoint: Universe - ONI
  3. Halo: First Strike - Page 49
  4. Halo: Fall of Reach, Page ??
  5. Halo: Escalation
  6. 6.0 6.1 Halo: Hunters in the Dark - Page 67
  7. Halo Waypoint: Universe - Factions - Spartans
  8. Halo Encyclopedia, Page 44
  9. Halo: Silent Storm - A Master Chief Story - Chapter 1, Page ??
  10. 10.0 10.1 Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo - Pages 90-92
  11. Halo Waypoint: Canon Fodder - Log of War
  12. Halo: Fractures - Extraordinary Tales from the Halo Canon - Rossbach's World, Page ??
  13. Halo 3 - Level: Tsavo Highway
  14. Halo: Warfleet – An Illustrated Guide to the Spacecraft of Halo, Page 47
  15. Halo 4: The Essential Visual Guide, Page 34

Start a Discussion Discussions about Office of Naval Intelligence

  • Does ONI and UNSC will be new Covenant???

    17 messages
    • I don't know how months work where you are from, but I'm fairly sure that May-September is quite a bit more than three months.
    • According to santa claws conquers the Martians (very misleading tital) their is such a month as "septober".
  • ONI vs UNSC

    16 messages
    • Nice job finding this Vman, now lets see what kind of catastrophic destruction I can add to the story :) haha hahaha hahahahahha HAHAHAHAHhahahHAHA!
    • Lord of the STARS wrote:Nice job finding this Vman, now lets see what kind of catastrophic destruction I can add to the story :) haha hah...