Office of Naval Intelligence

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This article is about the intelligence branch of the UNSC. For the Halo 3: ODST track, see The Office of Naval Intelligence (music).
Office of Naval Intelligence
ONI Seal 1.png
The Seal of the Office of Naval Intelligence

ONI agents about to abduct Daisy-023 for the SPARTAN-II program.




United Nations Space Command




Intelligence agency


  • Fleet observation and analysis
  • Propaganda
  • Espionage
  • Clandestine reconnaissance
  • Advanced research


Semper Vigilans (Always Vigilant)[2]






Emile-A239: "Kat, you read his file?"
Kat-B320: "Only the parts that weren't covered in black ink."
Catherine-B320 remarks on ONIs censorship of SPARTAN-B312's file.[5]

The Office of Naval Intelligence (ONI, commonly pronounced phonetically as /oʊni/) 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.[6]

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 humanity in 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.[1]


The Office of Naval Intelligence was founded in 2178.[7][1]

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 Authority soldiers. However this initial run was eventually postponed.[8]

Pre-Covenant war[edit]

In 2491, the Carver Findings were released and ONI began to use it as their approach to the Insurrectionists.[9]

In 2517, candidates for the new Generation II ORION Project were kidnapped and brought to Reach for training.[10]

Human-Covenant War[edit]

Main article: Human-Covenant War

In the first several months of the war, some ONI analysts believed the Covenant may have visited Earth in the past. Part of this was due to the meter and a half tall Unggoy the Covenant employed. As such, the Covenant received the nickname "LGM" or "Little Green Men".[11]

Over the course of the war, ONI eliminated or gained control over most competing civilian and military espionage services.[12]

By 2552, ONI was also known as the "UNSC Military Intelligence Division".[10] Prior to the attack on Earth in that year, members of Blue Team reported to an ONI council.[13] Later during the Battle of Kenya of that year, ONI Recon 111 helped provide intelligence in the field to UNSC forces.[14]


Following the war, the Office of Naval Intelligence had become the primary intelligence service of the UEG with nearly uncontested power in this field.[12] ONI was also afforded a great deal of autonomy, due to its connections with the UNSC Security Council.[15]

As of 2555, Admiral Margaret Parangosky was replaced with Admiral Serin Osman as Commander-in-Chief.[16]

By 2558, ONI had a liaison with the HIGHCOM Security Committee.[17]

During the Created conflict, ONI teams sanitized data on Earth.[18] As well, CINCONI Serin Osman went into hiding, along with Fleet Admiral Terrence Hood.[19]

Role and operations[edit]

Macer: "I know better than to trust you."
Locke: "We wouldn't be doing our job if people trusted us."
Jameson Locke and Talitha Macer discuss the nature of ONI.[20]
Halo: Nightfall screenshot
Two ONI agents, LTJG Mason Hundley and LT Jordan Gaines, on their mission in Sedra City.

The Office of Naval Intelligence is responsible for UNSC signals intelligence (SIGINT), human intelligence (HUMINT), counter-espionage, propaganda, and top-secret research and development programs. The agency mostly operates independently of other UNSC branches, and at times it contravenes the law and UNSC protocol to complete top-secret missions. ONI's Commander-in-Chief (CINCONI), is Admiral Serin Osman, successor and protegé to Margaret Parangosky.[4]

As it is responsible for intelligence matters across the UNSC, 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-II and SPARTAN-III programs, are enigmatic, and its personnel are regarded as mysteries by mainstream naval officers.[21]

ONI is technically subordinate to the UNSC Naval Command. In practice, however, ONI's activities extend far beyond intelligence gathering, and often receives mandates and directives from HIGHCOM itself.[22] It is also not unheard of for ONI to operate without HIGHCOM's knowledge or official authorization, as was the case with Kilo-Five's mission; indeed, CINCONI is often considered to hold significant power within the UNSC[23][24] and even the Unified Earth Government as a whole.[1] All other competing intelligence services have been snuffed out long ago to ensure ONI's supremacy; according to the ONI AI Black-Box, "...there are no rival agencies. We castrated them all. Left them cowering in our shadow".[25]

ONI has an unusually large amount of military equipment for an intelligence service, and has a strong fleet presence. For example, ONI maintains joint control of the Navy's postwar flagship, UNSC Infinity,[26] and holds considerable sway over her crew.[4] ONI also maintains the UNSC's prowler fleet, a major source of Covenant deployment intelligence, under the auspices of the UNSC Prowler Corps. The Office of Naval Intelligence possesses a stealth cruiser, UNSC Point of No Return, which is used as a command vessel and a secure conference location. ONI also manages field intelligence with units such as ONI Recon 111 liaising with mainstream UNSC military units.[27]

ONI exerts virtually complete control over the flow of information across the territories under UEG control. Over the course of humanity's colonial era, a number of scattered alien artifacts built by a long-vanished civilization later to be known as the Forerunners were discovered. ONI secretly concealed all of these findings and maintained a monopoly on xenoarchaeological research into them;[28] any civilian scientists studying the artifacts would be drafted by ONI.[29] In order to prevent information from leaking to the public, ONI is capable of initiating system-wide data purges which erase all information on a given subject. A noted example of this is Onyx, originally surveyed as an ideal world for human settlement but erased from all UEG databases by ONI due to the alien technology discovered there.[30]


"Is ONI one happy family? Oh, please. We've got four divisions, officially, and only one of them knows that we've actually got more than that. There's Section Two—made up of psyops and PR, who each kid themselves they're not like the other at all—which tells the lies; Section Zero, which thinks it spies on everyone else, tells lies to Section Two, and thinks it tells lies to Sections One and Three; Section One does stuff we can almost talk about, they interface with other branches; and Section Three does the stuff we can't talk about or else it would have to kill everyone in fascinating and groundbreaking new ways. Technically, you're not a numbered section at all. You're the praetorian guard for CINCONI, in a way, and we just call CINCONI's staff Core Four, although it's actually in Core Five of Bravo-6, and DCS reports directly to it. You'll note I didn't mention HIGHCOM, and that's because all ONI sections lie to HIGHCOM and tell it that it's the most powerful body on Earth, which generally works well at keeping the old buffers convinced that they make the decisions. Now, are you confused? I certainly hope so, because that's my mission."
Black-Box, explaining the perceived structure of ONI to the rest of Kilo-Five, and only partly joking[24]

Section Zero[edit]

Main article: ONI Section Zero

Section Zero is ONI's Internal Affairs department, charged with rooting out and eliminating illegal programs.[31] Section Zero is very discreet in its work; the true nature and activities of the division are highly classified and unknown outside the ONI command hierarchy.[6] However, it appears that the other sections of ONI know Section Zero exists and while they are successful at deceiving Section Two, Sections One and Three are not as easily lied to and all three other sections are not easily spied on.[24]

Section One[edit]

Main article: ONI Section One

Section One is the proper intelligence-gathering branch of ONI. As such, the section's services are most often utilized by UNSC forces.[6] Its responsibilities include information gathering and codebreaking through military espionage.[1] Information released by Section One includes evacuation notices for colony worlds and Covenant force deployments.[6] Section One is responsible for covering up all information on locations ONI wishes to keep hidden from the public eye, such as Onyx.[32]

Section Two[edit]

Main article: ONI Section Two
Benjamin Giraud working to propagandise a battle scene.
Benjamin Giraud works with Section Two to make battlefield imagery appear less grotesque.

Section Two is the propaganda branch of ONI; they are also responsible for psychological operations.[24] Overtly, however, Section Two only deals with external communication and public morale.[1] It handles communication between colonies to reduce the spread of rumors and information that would damage morale.[33] It was responsible for releasing details of the SPARTAN-II program to the public to boost morale throughout UEG territory.[34] Once information about the Spartans was released to the public, Section Two 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.[6] Section Two is also responsible for broadcasting pre-recorded human carrier signals from various locations into slipspace to confuse Covenant triangulation technology, preventing them from discovering Earth.[35]

Section Three[edit]

Main article: ONI Section Three

Section Three is the top-secret projects division of ONI that oversees the various groups responsible for creating new innovations through the use of advanced alien technology.[1] It is responsible for the SPARTAN-II and SPARTAN-III programs and many other black operations.[6] Though a few of Section Three's programs are well-known and are widely celebrated for their success, the UNSC Marine Corps 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. Though its overall purpose is unknown, Section Three's Beta-3 Division is known to analyze captured Covenant technology such as the Kig-Yar point defense gauntlet.[36] In addition to performing black operations, Section Three's Beta-5 Division operates the SPARTAN-III program, which is kept secret from the majority of Section Three. This compartmentalization is designed to ensure secrecy and security. The Delta-6 Division has oversight of an unknown number of SPARTAN-IVs in stealth operations, including counterinsurgency missions.[37]

Sub-divisions and ties[edit]

  • Tip of the Shadow: Tip of the Shadow is a sub-division of Section 3 dedicated with the recovery, analyzing, and decoding, of data that Section 3 is stuck with.

Section Four[edit]

Main article: ONI Section Four

Section Four is a clandestine survey group employed by ONI for the reconnaissance of new worlds, alongside conducting xenoarchaeology efforts. These efforts are used by ONI to claim new worlds for their own personal use, without oversight of the Unified Earth Government.[39]


In addition to the primary numbered sections, there are also a number of lesser-known or "theoretical" subdivisions within ONI.[1]

Strategic Response Unit
A major decision-making body of three key individuals within ONI, conferring during major crises such as the onset of the Human-Covenant War.[40]
Signal Corps
The Signal Corps is tasked with broadcasting radio signals in order to confuse Covenant fleet and troop movements, diverting attention from UEG colonies that are evacuating.[41]
The prowler UNSC Aladdin.
Prowler Corps
The Prowler Corps oversees the deployment of prowlers and their electronic intelligence gathering.[42]
Department of Colonial Security
A former branch of the Colonial Administration Authority, the DCS was absorbed into ONI sometime after Margaret Parangosky achieved the rank of Captain the following the CAA's assimilation into the UNSC. The DCS operates intelligence-gathering agents within the colonies, and reports directly to CINCONI.[24]
The Reverse Engineering and Prototyping–Xenotechnology department is tasked with developing advanced technologies from alien sources, both Covenant and Forerunner.[43] They receive unlimited funding and resources and are unknown outside the Office of Naval Intelligence.[43] The department was formed from many smaller groups created during the Human-Covenant War. Like the Materials Group, it helped disseminate new weapons and shield technologies to UNSC forces as the war neared its end by way of firms such as Misriah Armory.[43] Their activities include weapon development, technology research and analysis, reapplication of alien technology, vehicle development, and research into hard light technology.[43] The REAP-X department's greatest breakthrough was the discovery of a working Forerunner slipspace drive used to complete the UNSC Infinity, the post-war flagship of the UNSC Navy. The department utilizes many variants of standard military vehicles modified for special missions.[43]
Physical and Technical Security Office
Charged with the security of UNSC military bases and information depots.[44]
ONI Security
The main security force of the Office of Naval Intelligence, with personnel generally recruited from UNSC Army and Marine candidates.[45] A detachment of ONI Security was stationed on Ivanoff Station when it was attacked by the Didact.[46]


Members of Kilo-Five preparing for the next mission.


Main article: UNSC Special Forces

Symbols and insignias[edit]

Main article: Symbols of the Office of Naval Intelligence

The agency's seal has many layers of meaning: superficially it is a stylized surveillance satellite, but it also represents a pyramid of knowledge with an all-seeing eye and an arrowhead directed to the heavens.[48]


Main article: ONI personnel

ONI personnel, especially officers, are often referred to as "spooks".[21] Many ONI agents enjoy significant latitude in the discharge of their duties, often violating legal and moral boundaries or acquiring vast amounts of UNSC resources to achieve their ends.[49] 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 termination of employment.[citation needed]

Notable individuals employed by ONI include the following:

Civilian consultants


Field manuals[edit]

ONI provides field manuals on a number of topics for use with its personnel.

Ships and vehicles[edit]

Ship types

Individual ships

Argent Moon - ONI research and development station.


The Office of Naval Intelligence maintains its own vehicles for use by its private security forces.


Ivanoff Station, an asteroid-based research facility near Installation 03.

Many Office of Naval Intelligence facilities employ a very distinct style of architecture and design, which reflects the organization's role and field of work. Whereas the typical UNSC aesthetic favors a militaristic and utilitarian approach, ONI's structures are often monumental and imposing, covered in angular surfaces and sharp edges, resulting in an overall impression similar to a stealth aircraft, a motif also present in the ONI's prowlers. The angled exteriors are contrasted by crisp, sterile interior spaces with cold-toned lighting and chiefly white surfaces as well as heavy use of glass and steel in larger spaces such as atriums. Examples of such architecture can be found in ONI's SWORD Base, shaped like an upward-pointing wedge covered in metallic plating, the needle-like Olympic Tower, as well as the enormous, cube-shaped ONI Alpha Site in New Mombasa.

Beta Gabriel
Chi Ceti IV
Epsilon Eridani system Oort cloud
Erebus VII
Installation 03
Installation 05
New Gangwon
  • Unidentified weapons research facility
Requiem (destroyed)
  • ONI Research Facility Trevelyan
Unknown location


  • In reality, the Office of Naval Intelligence is an agency of the United States Navy that was established in 1882. There is also an Australian intelligence agency known as the Office of National Intelligence that was established in 2018 and shares the same acronym.
  • ONI's motto, "Semper Vigilans",[2] is also the motto of the United States Civil Air Patrol. The phrase is Latin for "Always vigilant."
  • Halo: The Fall of Reach refers to ONI as the UNSC Military Intelligence Division.[51] This name has never been mentioned in subsequent media, though the reference remains in the 2010 re-release of the book. Presumably, this is a production mistake rather than an alternate in-universe name; ONI had not yet been firmly integrated within canon so the Military Intelligence Division may have been a real-world working title for the group.
  • ONI's pre-Halo 3: ODST insignia features the all-seeing eye, a nod to ONI's line of work. The current symbol may also be interpreted as a stylized depiction of the eye motif.
  • Oni is the name of a Bungie third-person action game which predates Halo: Combat Evolved. The game in turn is named for an ogre-like creature from Japanese mythology.
  • An official Halo Waypoint forum user known as Catalog (posing as the entity of the same name) refers to the Office of Naval Intelligence as "[frumentarii]". The frumentarii were the secret service of the Roman Empire, reflecting ONI's position within the UNSC. Catalog also notes that it has infiltrated ONI data cores on several occasions.


List of appearances[edit]


  1. ^ a b c d e f g h Halo Waypoint, ONI (Retrieved on Jun 30, 2021) [archive]
  2. ^ a b Halo: First Strike, p. 49
  3. ^ Halo: The Fall of Reach, p. 18
  4. ^ a b c Halo 4 - Spartan Ops, episode SpOps, level Expendable
  5. ^ Halo: Reach, campaign level Noble Actual: "I've seen your file. Even the parts the ONI censors didn't want me to" - Carter-A259
  6. ^ a b c d e f Halo Encyclopedia (2011 edition), page 67
  7. ^ Halo 4: The Essential Visual Guide, page 229
  8. ^ Halo Waypoint, Spartans (Retrieved on Jun 30, 2021) [archive]
  9. ^ Halo Encyclopedia (2009 edition), page 44
  10. ^ a b Halo: The Fall of Reach, Chapter ??
  11. ^ Halo: Silent Storm, chapter 1
  12. ^ a b Halo: Warfleet - Glossary, page 90-92
  13. ^ Halo 2: Anniversary, Terminal 15 - Unyielding
  14. ^ Halo 3, campaign level, Tsavo Highway
  15. ^ Halo Waypoint, UNSC (Retrieved on Jun 30, 2021) [archive]
  16. ^ Halo: Hunters in the Dark, p. 67
  17. ^ Halo: Escalation
  18. ^ Halo Waypoint, Canon Fodder - Log of War (Retrieved on Jun 30, 2021) [archive]
  19. ^ Halo: Fractures - Rossbach's World
  20. ^ Halo: Nightfall, Chapter 2
  21. ^ a b Halo: The Fall of Reach, p. 18 (2001)
  22. ^ Halo Encyclopedia (2009 edition)
  23. ^ Halo: Ghosts of Onyx, p. 44
  24. ^ a b c d e Halo: Mortal Dictata, p. 199
  25. ^ Halo: Glasslands, chapter 17
  26. ^ Halo: The Thursday War, p. 46
  27. ^ Halo 3, campaign level Tsavo Highway
  28. ^ Halo Encyclopedia (2009 edition), page 43
  29. ^ Halo: Evolutions, "From the Office of Dr. William Arthur Iqbal"
  30. ^ Halo: Ghosts of Onyx, p. 124
  31. ^ a b I Love Bees
  32. ^ Halo: Ghosts of Onyx, p. 48
  33. ^ Halo: First Strike, p. 98 ("ONI Section Two had done a brilliant job of preserving the fiction that Earth forces held their own against the Covenant.")
  34. ^ Halo: Ghosts of Onyx, p. 46
  35. ^ Halo: Evolutions - Essential Tales of the Halo Universe, The Impossible Life and the Possible Death of Preston J. Cole, Section Six: The Covenant War: The Cole Campaigns (2525-2532 CE)
  36. ^ Dr. Halsey's journal, January 10, 2536 entry - third page
  37. ^ Halo 4 Interactive Guide (defunct)
  38. ^ Halo: The Essential Visual Guide, p. 155
  39. ^ Halo Encyclopedia (2022 edition), page 63
  40. ^ Halo Wars: Genesis
  41. ^ TVG Chats To The ILoveBees Operator
  42. ^ Halo: Ghosts of Onyx, p. 326
  43. ^ a b c d e Mega Bloks, Special Report: ONI REAP-X
  44. ^ Halo Infinite, Armor Hall: Security - Helmet Description "Defending information depots and military sites remains a critical task for Spartans detached for assignment with ONI's Physical and Technical Security Office."
  45. ^ Halo 4: The Essential Visual Guide, p. 34
  46. ^ Halo 4, campaign level, Composer
  47. ^ Halo: Warfleet, p. 34
  48. ^ Halo Mythos, p. 141
  49. ^ Halo: Evolutions, "The Mona Lisa"
  50. ^ Halo: Fleet Battles
  51. ^ Halo: The Fall of Reach, page 19