Editing OSTEO combat engineering suit

{{Status|Canon}}
{{Armor infobox
|name=OSTEO
|image={{Pageimage|HINF HazmatRenders.jpg}}[[File:HINF OSTEO armor front.png|250px]]
|manufacturer=[[Imbrium Machine Complex]]
|testsite=
|type=*Combat engineering suit
|role=
*[[Combat engineer]]ing
*Explosive ordnance disposal
*[[HAZMAT]] operations{{Ref/Game|Id=HIAHCoreHazmat|HINF|Armor customization (Halo Infinite)|Armor Hall|Detail=Hazmat - Armor Core Description|Quote=Project: OSTEO combat engineering suits incorporate an array of contingency systems focused on surviving extended operations in extraordinarily harsh working and combat environments.}}{{Ref/Game|Id=HIAHHelmetHazmat|HINF|Armor customization (Halo Infinite)|Armor Hall|Detail=Hazmat - Helmet Description|Quote=Spartan combat engineers work in close cooperation with their Army and Marine cousins in demolition and hazmat missions, in addition to carrying out specialist tasks which require super-human reactions, strength, and situational awarenes.}}
|weight=
|features=Array of contingency systems{{Ref/Reuse|HIAHCoreHazmat}}
}}

The '''OSTEO combat engineering suit''', also known as the '''HAZMAT armor''', is a [[human]] armor system employed by unaugmented personnel as well as [[Spartan Operations]] personnel for [[HAZMAT]] operations.{{Ref/Site|Id=S4Customization|https://www.halowaypoint.com/news/customization-overview-season-4|Site=Halo Waypoint|Section=Halo Infinite|Page= Customization Overview - Season 4|D=19|M=6|Y=2023}} The suit was created as part of '''Project: OSTEO'''.{{Ref/Reuse|HIAHCoreHazmat}}{{Ref/Site|Id=CF142|URL=https://www.halowaypoint.com/news/canon-fodder-system-shocks|Site=Halo Waypoint|Page=Canon Fodder - System Shocks|D=30|M=06|Y=2023}}{{Ref/Twitter|Halo|1674794955997601792|Halo|Quote=TECH DATABASE - PROJECT: OSTEO The fruits of Project: OSTEO, this combat engineering suit is built to stand against all manner of threats and dangerous conditions, for use by both Spartans and non-augmented personnel. #FictionFriday|D=02|M=07|Y=2023}}

==Overview==
===Design details===
[[File:H5G LDminer.jpg|thumb|250px|left|A Liang-Dortmund miner using a mining rig of the OSTEO armor, created as a collaboration between Liang-Dortmund and the [[BXR Mining Corporation]].{{Ref/Reuse|CFTomes}}]]
The OSTEO armor platform incorporates an array of contingency systems focused on surviving extended operations in extraordinarily harsh working and combat environments. It is designed to be used by both [[Spartan]]s and non-augmented personnel in all manner of dangerous conditions.{{Ref/Reuse|S4Customization}} While other systems, such as Spartan [[MJOLNIR Powered Assault Armor]] already protects against many things, OSTEO is more specialized towards the specific role of protecting against natural and artificial environmental hazards, and provides a platform that is not exclusively usable by Spartans. Where MJOLNIR offer protections to a Spartan operating in compromised conditions, OSTEO-derived technologies maximize life maintenance effectiveness for extended periods, providing more optimized solutions for a wider range of suitable operators—including non-augmented military and [[civilian]] personnel.{{Ref/Reuse|CF142}} The OSTEO armor is also hardened against cyberattacks.{{Ref/Site|Id=Twitch|URL=https://www.twitch.tv/videos/1847985516|Site=Twitch|Page=Halo|Detail=Halo Infinite Season 4 Preview (6/16 @ 1pm pt)|Quote=But also is unique because it is hardened against cyberattack. So, it is able to have a higher level of cybersecurity than any other cores or armors, and it's suited for the infection that we have.|Quotee=Sean Baron (at 39:13)|D=16|M=06|Y=2023}}

The OSTEO armor platform—even when utilized by civilians—is outfitted with onboard solutions to interface with various infotech and [[artificial intelligence]] control systems, which have become ubiquitously integrated into [[:Category:26th century|twenty-sixth century]] industrial and environmental infrastructures. These features give OSTEO wearers the agility to deal with both the technological and physical sides of hazardous events that might befall a human colony or installation.{{Ref/Reuse|CF142}} 

The T21-HEX4 hip utility is considered part of the complete OSTEO suit, being included on the relevant shipping manifest, but only [[Imbrium Machine Complex]] knows what it does.{{Ref/Game|Id=HIT21HEX4|HINF|Armor customization (Halo Infinite)|Armor Hall|Detail=T21-HEX4 Utility Description|Quote=It's part of the shipping manifest of a complete OSTEO, but only IMC knows what it does, exactly.}}
{{Clear|left}}
===Development history===
In the years after the [[Human-Covenant War]], private industry across several [[human]] [[Human colonies|colonies]] saw rapid development in many fields, with [[Powered exoskeleton|exoskeletal frames]] seeing considerable research and development. Project: OSTEO and its resulting combat engineering suit were among the fruits of these advancements. Primarily developed by [[Imbrium Machine Complex]], the OSTEO armor system is the result of a shared-source initiative to build an armor platform wearable by both supersoldiers and non-augmented humans for everything from construction and exploration to security and combat applications.{{Ref/Reuse|CF142}} Refitted [[MJOLNIR Powered Assault Armor/Mark VI|Mark VI]] helmets called [[Mark VI CBRN]] were used throughout the testing and evaluation of OSTEO.{{Ref/Game|Id=HIMarkVICBRN|HINF|Armor customization (Halo Infinite)|Armor Hall|Detail=Mark VI CBRN - Helmet Description|Quote=Refitted Mark VI helmets were used throughout the testing and evaluation of OSTEO.}} In the wake of the galaxy’s [[Post-Covenant War conflicts|most recent conflicts]], the [[United Nations Space Command]] has expressed interest in projects like OSTEO, modifying industrial-focused designs to used by Spartans and special forces operatives.{{Ref/Reuse|CF142}}

===Usage===
[[File:H5G PMCGuard Screenshot.jpg|thumb|250px|A Liang-Dortmund corporate security guard employing a combat rig of OSTEO.{{Ref/Reuse|CFTomes}}]]
OSTEO armor is used by personnel who are sent on missions deep into dying [[Forerunner]] facilities, for hunters operating in and around poisoned water and air, search teams exploring sites scarred by [[:Category:Chemical weapons|chemical]], [[:Category:Biological weapons|biological]], radiological, and [[nuclear weapon]]s used in the Human-Covenant War,{{Ref/Reuse|S4Customization}} as well as those facing pockets of [[Flood]] infestation.{{Ref/Reuse|CF142}} It is also used by Spartan [[combat engineer]]s working in demolition and hazmat missions, in addition to carrying out specialist tasks which require super-human reactions, strength, and situational awareness.{{Ref/Reuse|HIAHHelmetHazmat}}

[[Liang-Dortmund Corporation|Liang-Dortmund]] personnel involved in "de-[[glassing]]" activities on former-[[human colonies]] destroyed during the [[Human-Covenant War]] often use OSTEO suits for navigating the borderline-uninhabitable terrain of the worlds they're working on. LDC security forces use combat variations of OSTEO for guarding corporate assets at these sites, fitted with specialised peripheral equipment, helmets, and body armour.{{Ref/Site|Id=CFTomes|URL=https://www.halowaypoint.com/news/canon-fodder-tasty-tomes|Site=Halo Waypoint|Page=Canon Fodder - Tasty Tomes|D=24|M=03|Y=2025}} The asteroid miners of the [[Imbrium Machine Complex]] corporation also use OSTEO rigs for operations in and around [[Elvie]].{{Ref/Novel|Halo: Saturn Devouring His Son}} Likewise, [[BXR Mining Corporation]] also use OSTEO suits for [[titanium]] mining operations on the surface of [[KC-59]].{{Ref/Novel|Halo: From the Soil to the Stars}}

===Variants===
[[File:H5G DivingSuits Screenshot.jpg|250px|thumb|Heavy OSTEO rigs used for deep-sea, toxic, and volcanic environments, alongside enduring glass storms. However, it is noted for its bulk.{{Ref/Reuse|CFTomes}}]]
A list of variants compatible with the OSTEO armor platform:
*[[ASHMAW-class helmet|Ashmaw]] - A variant designed for use on derelict ships and hazardous moons
*[[BURROWLENS-class helmet|Burrowlens]] - A variant for Spartans who are mediators of the larger war machine
*[[Exo-class helmet|Exo]] - A variant to protect against a range of hazards, from small-arms fire to high-energy plasmas
*[[FARKAS-class helmet|Farkas]] - A variant for Spartans operating in former Human-Covenant War battlegrounds
*[[Gourdian Knight|Gourdian Knight]] - A variant for protectors of the fallow court 
*[[Mark VI CBRN]] - A variant consisting of a refitted [[MJOLNIR Powered Assault Armor/Mark VI|Mark VI]] helmet
*[[NOTUS-class helmet|Notus]] - A variant for usage in highly poisonous, corrupted, and blighted environments
*[[OBERON-class helmet|Oberon]] - A variant designed to compensate for the loss of [[Smart AI|Smart AIs]] 
*[[OGUN-class helmet|Ogun]] - A variant for scavenging critical components from destroyed ships
*[[Project CORSAC]] - A variant for missions without the need of [[Visual Intelligence System, Reconnaissance|visors]]
*[[SERKET-class helmet|Serket]] - A variant with several layers of redundant filters and seals  
*[[SKARBNIK-class helmet|Skarbnik]] - A variant for Spartans infiltrating dying Forerunner structures 
*[[STEELHEART-class helmet|Steelheart]] - A variant to deal with Flood-infected victims
*[[TEMFOR-class helmet|Temfor]] - A variant with many precautions against the Flood
*[[Theon-class helmet|Theon]] - A variant formerly exclusive to ONI Zeta-2 whisper teams
*[[VOIDSPEAR-class helmet|Voidspear]] - A variant to protect [[Extra-vehicular activity|spaceborne]] combat engineers

==In-game information==
===''Halo 5: Guardians''===
OSTEO suits appear multiple times throughout ''[[Halo 5: Guardians]]'', though were not named as such until a [[Canon Fodder]] blog in [[2025]]. The OSTEO rigs in the game are not usable by the player, and can predominantly be seen in the levels [[Glassed]], [[Meridian Station]], [[Unconfirmed]], and [[Evacuation]], as the mining and combat suits worn by the Liang-Dortmund miners and security personnel. Another, more specialised and bulky variant of OSTEO, can be found in the game's [[multiplayer]] component as a static prop on several maps including [[Molten]].{{Ref/Reuse|CFTomes}} This latter variant has the appearance of a bulky diving suit and is primarily found as a scenery object on the map [[Fathom]], and can be placed as a static prop in the game's [[H5G:Forge|Forge mode]].

The [[UNSC diver]] Easter Egg in the game also reuses the heavy OSTEO model.
<gallery>
File:H5G MeridianMiners.png|Various Liang-Dortmund miners and security troops using OSTEO rigs.
File:UNSC Diver.png|The UNSC diver Easter Egg.
</gallery>

===''Halo Infinite''===
Like [[Chimera (armor)|Chimera]] before it, the Hazmat armor core was available by default during [[Season 04: Infection]], the fourth [[season]] of ''[[Halo Infinite]]'' [[multiplayer]]. It was first revealed on [[2023#May|May 26, 2023]], in an advertisement for a cross-promotion with [[Wikipedia:Dr. Squatch|Dr. Squatch]] soap.{{Ref/Twitter|Id=Squatch|Halo|1662126558176215040|Halo|Quote=Rank up your routine with the LIMITED EDITION Spartan Scrub soap and the new Spartan Shield deodorant from @drsquatchsoapco Plus unlock free Halo Infinite in-game content for Season 4 with the code inside the soap box!|D=26|M=05|Y=2023}}
{| class="wikitable" style="width: 75%;"
! scope="col" style="width: 15%" |Armor
! scope="col" style="width: 15%" |Manufacturer
! scope="col" style="width: 45%" |Lore
! scope="col" style="width: 10%" |Rarity
! scope="col" style="width: 15%" |Unlock Requirements
|-
|align="center"|[[File:HINF Hazmat Core Icon.png|75px]]<br>Hazmat armor core
|[[Imbrium Machine Complex]]
|Project: OSTEO combat engineering suits incorporate an array of contingency systems focused on surviving extended operations in extraordinarily harsh working and combat environments.
|Common
|Unlocked by default during [[Season 04: Infection]]
|-
|align="center"|[[File:HINF - Helmet icon - Osteo.png|75px]]<br>Osteo
|Imbrium Machine Complex
|Spartan combat engineers work in close cooperation with their Army and Marine cousins in demolition and hazmat missions, in addition to carrying out specialist tasks which require super-human reactions, strength, and situational awareness.
|Common
|Unlocked by default during Season 04: Infection
|}
====Attachments====
The following attachments are not exclusive to the OSTEO helmet, and are compatible with other helmets on the Hazmat core.
*Signaltech Deepeye

==Trivia==
The OSTEO combat engineering suit is likely named after the [[Wikipedia:Greek|Greek]] word ''[[Wiktionary:osteo-|ostéon]]'', meaning "bone."

==Gallery==
{{Linkbox|gallery=yes|gallerypage=Images of Hazmat}}
===Concept art===
<gallery>
File:H5G_MeridianMiners_Concept_1.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_2.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_3.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_4.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_5.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_6.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_7.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_8.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G_MeridianMiners_Concept_9.jpg|Concept art of civilian OSTEO-clad miners for ''Halo 5: Guardians''.
File:H5G DivingSuit Concept Sketches.jpg|An early concept piece for the "diving suit" OSTEO rig in ''Halo 5: Guardians''.
File:H5G-Diver concept.jpg|Concept art for the "diving suit" OSTEO rig in ''Halo 5: Guardians''.
File:HINF Concept HazmatExploration1.jpg|Early concept exploration for the OSTEO combat engineering suit for ''Halo Infinite''.
File:HINF Concept HazmatExploration.jpg|More concept exploration of the suit. Note the Farkas-like helmet on the right Spartan.
File:HINF Concept HazmatHelmets.jpg|Concept exploration of various helmets for the suit.
File:HINF Concept HazmatExploration2.jpg|Near-finalized concept exploration for the OSTEO combat engineering suit.
File:HINF Concept OSTEO1.jpg|Finalized concept art of the OSTEO combat engineering suit.
File:HINF Concept OSTEO2.jpg|The previous concept art with an alternate set of shoulder pads.
File:HINF Concept HazmatAttachments.jpg|Concept exploration of several helmets and attachments for the OSTEO suit.
File:HINF Concept HazmatAttachments2.jpg|More concept exploration of helmets and attachments for the OSTEO suit.
File:HINF Concept HazmatAttachments3.jpg|More concept exploration of helmets and attachments for the OSTEO suit.
File:HINF Concept LifeguardHeartguard.jpg|Concept art of the Lifeguard Heartguard chest armor.
File:HINF Concept LifeguardDoc.jpg|Concept art of the Lifeguard Doc chest armor.
File:HINF Concept Trapbox.jpg|Concept art of the Trapbox chest armor.
File:HINF Concept FirstResponder.jpg|Concept art of the First Responder chest armor.
File:HINF Concept Pro-TekBuster.jpg|Concept art of the Pro-Tek Buster chest armor.
File:HINF Concept CombiGuard.jpg|Concept art of the CombiGuard chest armor.
File:HINF Concept VenezianOmnicorder.jpg|Concept art of the Venezian Omnicorder chest armor.
File:HINF Concept SamplePack.jpg|Concept art of the Sample Pack shoulder pad.
File:HINF Concept LifeguardOXYLINK Shoulder.jpg|Concept art of the Lifeguard OXYLINK shoulder pad.
File:HINF Concept Bracepad.jpg|Concept art of the Bracepad shoulder pad.
File:HINF Concept FanVent.jpg|Concept art of the Fan Vent shoulder pad.
File:HINF Concept ThreatwaveSMI.jpg|Concept art of the Threatwave SMI shoulder pad.
File:HINF Concept TypeHPE.jpg|Concept art of the Type HPE gloves.
File:HINF Concept GuardGrip.jpg|Concept art of the GuardGrip gloves.
File:HINF Concept GreenSteelSketch.jpg|Concept sketch of the Green Steel utility.
File:HINF Concept GreenSteel.jpg|Finalized concept art of the Green Steel utility.
File:HINF Concept Crowbar.jpg|Concept art of the Crowbar utility.
File:HINF Concept QuickFlush.jpg|Concept art of the QuickFlush utility.
File:HINF Concept HazmatHipAndShoulder.jpg|Concept art of the Dualpack Dousers utility and Biolocker shoulder pad.
File:HINF Concept LifeguardOXYLINK.jpg|Concept art of the Lifeguard OXYLINK kneepad.
File:HINF Concept K-SHOK Dampeners.jpg|Concept art of the K-SHOK Dampeners kneepad.
File:HINF Concept TypeKIRST.jpg|Concept art of the Type KIRST kneepad.
File:HINF Concept HazmatStuff.jpg|Concept art of various attachments.
File:HINF Concept HazmatBoot.jpg|Concept art of the boots used with the OSTEO combat engineering suit.
File:HINF Concept HazmatProsthetic.jpg|Concept art of the [[Artificial limb|prosthetic limb]]s associated with the OSTEO combat engineering suit.
File:HINF Concept HazmatHands.jpg|Concept art of the prosthetic hands associated with the suit.
</gallery>
===Promotional images===
<gallery>
File:HINF_HAZMATCore_SpartanTrio_Announce.png|Hazmat (left), as seen on the Dr. Squatch-''Halo Infinite'' tie-in website.{{Ref/Site|URL=https://uk.drsquatch.com/pages/halo?|Site=Dr. Squatch|Page=Halo|D=26|M=05|Y=2023}}
File:HINF HAZMATCore Spartan Announce.png|Another look at the Hazmat core in the Dr. Squatch advertisements.
File:HINF HAZMATCore Chest Announce.jpg|A closeup of Hazmat's chest plate.
File:HINF HazmatRenders.jpg|A pair of Hazmat armors.
File:HINF - Store icon - Combined Arms HAZMAT Papaya.png|Hazmat render.
</gallery>
===Screenshots===
<gallery>
File:HINF - Season 04 trailer - Hazmat - 00001.png|A [[SPARTAN-IV program|Spartan-IV]] wearing Hazmat, reloading a [[BR75 battle rifle]].
File:HINF - Season 04 trailer - Hazmat - 00002.png|A Spartan wearing Hazmat, utilizing a unique weapon model on the BR75.
File:HINF - Season 04 trailer - Hazmat - 00003.png|An infected Spartan wearing Hazmat during a game of [[Infection]].
File:HINF - Season 04 trailer - Hazmat - 00004.png|A group of Spartans, all wearing Hazmat.
File:HINF PK S4 01.jpg|A Hazmat-clad Spartan inspecting a [[BR75 battle rifle]] at the Weapon Bench.
File:HINF MarkVICBRN.jpg|A Hazmat-clad Spartan with the [[Mark VI CBRN]] helmet.
File:HINF PK S4 04.jpg|Two Hazmat-clad Spartans employing the [[OBERON-class helmet|Oberon]] and [[SKARBNIK-class helmet|Skarbnik]] helmets.
File:HINF PK S4 15.jpg|A Hazmat-clad Spartan with the [[Mark VI CBRN]] helmet.
File:HINF - Event - Containment - 00002.jpg|A Hazmat-clad Spartan with the [[OGUN-class helmet]].
File:HINF - Event - Cyber Showdown II - 00009.jpg|A Hazmat-clad Spartan in combat.
File:HINF PK Reclaimer 15.jpg|A Spartan clad in Hazmat and the [[NOTUS-class helmet]] firing a [[Sicatt Workshop shock rifle|shock rifle]].
</gallery>

==List of appearances==
*''[[Halo 5: Guardians]]'' {{1st}}
*''[[Halo Infinite]]'' 
**''[[Season 04: Infection]]'' {{C|First identified}}
*''[[Halo: Saturn Devouring His Son]]''
*''[[Halo: From the Soil to the Stars]]''

==Sources==
{{Ref/Sources}}

{{Armor/Permutation|HI}}
{{Navbox/Universe/Mjolnir|Overview|Other}}
[[Category:MJOLNIR armor]]
[[Category:Armor]]
[[Category:Halo Infinite multiplayer armor permutations]]