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Office of Naval Intelligence

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

ONI Seal 1
Office of Naval Intelligence


Since 2163


Unified Earth Government






Intelligence Service


  • To provide intelligence for Naval forces
  • Acquisition and development of military equipment


Semper Vigilans (Always Vigilant)[1]



[Source]   [Talk]

The Office of Naval Intelligence, acronym ONI (pronounced as oʊni), is the intelligence service branch of the UNSC Navy. Its formal name is the UNSC Military Intelligence Division.[2] Admiral Margaret Orlenda Parangosky was the Commander in Chief of ONI until some point before 2558 at the latest, at which time her protege Serin Osman replaced her as Commander in Chief of the Office of Naval Intelligence.


The Office of Naval Intelligence is a division of the UNSC Navy that is responsible for counter-espionage and propaganda.

Although it is under the jurisdiction of the Navy, ONI appears to report directly to HIGHCOM. It is responsible for 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". 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.


ONI emblem

Pre-Halo 3: ODST ONI symbol.

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.[3]

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.


Section ZeroEdit

The most secretive section, Section Zero's existence is not general knowledge outside ONI. Details of its role and operations are limited. Based on the records of an AI named Melissa, it is thought to be ONI Internal Affairs, charged with rooting out and eliminating illegal programs.[4] It is very discreet in its work. The true nature and activities of Section Zero are highly classified and unknown outside the ONI command hierarchy. Zero is, essentially, an internal investigations division that polices other ONI activities.[5]

This section has gained notoriety as the section that keeps and maintains sealed SPARTAN-I Program file archives, including Avery Johnson's. As Internal Affairs it enforces the rules and ensures standards are met. It is authorized to use lethal force in the course of its operations.

Section IEdit

Section One is the main branch of ONI and the branch most often utilized by the UNSC. Information released by Section I includes evacuation notices for colony worlds and Covenant force deployments.[5]

Section IIEdit


Benjamin Giraud works with Section II to make battlefield imagery look less intimidating.

The propaganda branch of ONI. It handles communication between colonies to reduce the spread of rumors and information that would damage morale.[6] It was responsible for releasing details of the SPARTAN-II program to the public to boost morale throughout the UNSC.[7] Once information about the Spartans was released to the public, Section II had to maintain the Spartans' near-mythical status within the military by listing those killed in action as MIA. It was believed that news of Spartan deaths would cripple the UNSC's already-flagging morale.[5]

Section IIIEdit

The top-secret projects division of ONI. It is responsible for the SPARTAN-II project, the NOVA project, the MJOLNIR Program, and many other "black ops".[5] Though a few of Section III's programs are well known and celebrated for their success, the Marines and top brass of the UNSC treat most with contempt. This is especially true of the Spartans, who are regarded as "freaks" by some Humans. Beta-5 Division is the sub-cell of Section III that operates the SPARTAN-III project.[8][9] The Spartan-III project was kept secret from the vast majority of Section III. This is not particularly unusual as Section III is a large division with numerous sub-cells. The division and compartmentalization is to ensure secrecy and security. In addition the Delta-6 Division oversees the operations of Spartan-IV's on stealth missions. 

UNSC Prowler CorpsEdit

Main article: UNSC Prowler Corps

The ONI branch that handles the Prowlers and its electronic intelligence gathering.[9]

ONI Signal CorpsEdit

Main article: ONI Signal Corps

The Signal Corps is tasked with broadcasting radio signals in order to confuse Covenant fleet and troop movements, diverting attention from UNSC Colonies that are evacuating.[10]

ONI SecurityEdit

ONI Security is the Office of Naval Intelligence's security force recruited from the UNSC Army and UNSC Marine Corps. They provide security for sensitive locations such as Ivanoff Research Station and various sites on Requiem.

Known ONI PersonnelEdit

ONI ShipsEdit

ONI FacilitiesEdit


Main article: Reach


Main article: Trevelyan


Main article: Earth


Main article: Arcadia

Installation 03Edit

Main article: Installation 03


Main article: Oban

ONI UnitsEdit


  • ONI's pre-Halo 3: ODST insignia features the all-seeing eye, a nod to ONI's line of work.
  • The ONI insignia can be used as a multiplayer emblem in Halo 3: ODST and Halo 4.




  1. Halo: First Strike – page 49
  2. Halo: Fall of Reach
  3. Halo 3Tsavo Highway
  4. 4.0 4.1 I Love Bees
  5. 5.0 5.1 5.2 5.3 Halo Encyclopedia
  6. Halo: First Strike – page 98: "ONI Section Two had done a brilliant job of preserving the fiction that Earth forces held their own against the Covenant."
  7. Halo: Ghosts of Onyx – page 46
  8. Halo: First Strike
  9. 9.0 9.1 Halo: Ghosts of Onyx
  10. TVG Chats To The ILoveBees Operator
  11. Halo 3, Tsavo Highway

Start a Discussion Discussions about Office of Naval Intelligence

  • ONI vs UNSC

    12 messages
    • nowhere ive seen shows that ONI owns the Spartan IV's. in fact for the most part they carry naval rank many were former marines or ODST's wh...
    • Dude look at all the shit they are doing behind Hood's back regarding the Elites. Seriously ONI, what the hell?
  • The new character in halo 5

    14 messages
    • wrote:Agent Locke wrote:I never talked to halsey. I tried to use john to find and kill her, but never talked to her.Hey, since w...
    • exactly. and almost killed her too.

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