105th Shock Troops Division

The 105th Shock Troops Division is an Orbital Drop Shock Troops special operations force of the UNSC Marine Corps and part of the Marine Corps Special Operations Command. The division conducts missions for both Unified Special Warfare Command and Naval Special Warfare Command through UNSC geographical and space regions. Known as one of the most elite fighting forces in the UNSC Armed Forces, the 105th Shock Troops Division has participated in many battles and campaigns throughout its years of service. The 105th Shock Troops Division is also known as the Helljumpers and their insignia is a "Gold Comet."

Mission
The 105th's mission is to provide a special operations force to accomplish special operation missions assigned by the Unified Special Warfare Command, Naval Special Warfare Command, and Geographic Combatant Commander through their Theater Special Warfare Command. The Marines within the 105th are to assist with a variety of directives that range from direct contact with enemy troops to training colonial militias in special operation techniques. The 105th Shock Troops Division coordinates their deployments with the Unified Special Warfare Command and Naval Special Warfare Command, with engagement priorities throughout their assigned regional command.
 * Direct Action
 * Hostage Rescue
 * Special Reconnaissance
 * Unconventional Warfare
 * Counter-Terrorism
 * Counter-Insurgency
 * Counter-Contraband
 * Personnel Recovery

Organization
Under the command of a two-star General, the 105th Shock Troops Division has four active-duty Shock Troops Regiments that can conduct special operations. Each Shock Troops Regiment is led by a Colonel who oversees operations throughout the Battalions, Companies, and Platoons under his command. A Lieutenant Colonel leads a Shock Troops Battalion, there are four Battalions under each Regiment. Shock Troops Companies are led by a Major and there are four Companies under each Battalion. A Captain leads a Platoon; there are four platoons with each company.

Each Regiment and Battalion have a Headquarters and Service Company. In contrast, Companies have a Headquarters and Service Platoon to assist the command and control element with overseeing operations and missions. In the event of augmenting units from the Support Group, Engineer, Light Armored Reconnaissance, Force Reconnaissance/ODST, and Space Assault Battalion, each Regiment is capable of becoming a Regimental Combat Team which is led by the Regiment Commander.

The 105th Shock Troops Support Group is led by a Colonel and assists with assigning ODST Combat Service Specialists who specialize in fields like logistics and transportation along with ODST Capabilities Specialist who assist with intelligence, fire mission support, Explosive Ordnance Disposal and, a variety of other fields. Each Shock Troops Regiment has its own Support Group Battalion to staff enablers with platoons. The 105th Shock Troops Training Center is led by a Lieutenant Colonel who oversees the training of potential Marines to join the 105th Shock Troops Division and existing members who wish to attend more courses and schools to enhance their career as an ODST. For the 105th Shock Troops Engineer, they assist with mobility, counter mobility, survivability, and combat engineering support. The 105th Shock Troops Light Armored Reconnaissance Battalion is a Light-Armored Vehicle Battalion capable of providing forward vehicular reconnaissance and capable of providing fire support for other vehicle battalions nearby. The 105th Force Reconnaissance/ODST and 105th Space Assault Battalion are the two special operations capable battalions assigned to the 105th Shock Troops Division. Both focus on mission-specific deployments to assist the command when they are deployed with a Marine Expeditionary Unit as an ODST Special Purposes Force or with a 105th Shock Troops Battalion.

Activation
Following the colonization of Reach in 2362, the Commandant of the Marine Corps, Commanding General of Marine Corps Special Operations Command, and Commanding General of the ODSTs held a joint meeting with their staff to discuss the establishment of a Shock Troops Division in the Epsilon Eridani system. The three Generals expressed their desire to have a Shock Troops Division located at a strategic location to respond to threats that a Sol system Shock Troops Division was not capable of responding to in time. An officer from the ODST's staff suggested the 105th Shock Troops Division as its name and soon, the 105th Shock Troops Division began its preparations for becoming the first Marine Special Operations Force unit outside of Sol system.

Backlash within ODST Headquarters and MARSOC was met with opponents since there were enough ODST Divisions in the Sol system and it was much easier to move a reserve unit out instead of creating an entirely new active-duty SOF fighting force. However, support came from the Office of Naval Intelligence's Section One who found the idea to be smart and calculated due to the possible threats that could come about and the response time of the 105th to a threat. The Colonial Military Administration also showed support to the idea for having an elite unit to train colonists that join the ranks. Supporters won their arguments on response time, protecting civilians from unknown threats, and acting as a vanguard to the system. Unified Ground Command and Special Warfare Command feared that a unit out in the colonies would force them to spend more budget on maintaining a special operation fighting force that seemed to, on paper, pose no strategic value. With consistent backlash and support, the 105th Shock Troops Division ultimately made its way to the UNSC High Command to determine its activation in 2365.

In 2366, HIGHCOM authorized the activation of the 105th Shock Troops Division within the ODST Headquarters. The 2nd, 9th, and 19th Shock Troops Regiment moved under the banner of the new Division as logistical measures were put in place for the 105th to move out to Reach. The 105th Shock Troops Support Group and Training Center became the first subordinate units to assist the Division's Headquarters in supporting operations along with training ODSTs. For the rest of the decade, the 105th continued to build its ranks as it prepared to leave the Sol System by 2370 to settle on Reach.

Task Force Voyager
The UNSC put together Task Force Voyager to help establish the first few military units in a strategic location, the 105th worked closely with the 5th Interstellar Fleet to ensure safe travel for all cargo and passengers. Planners concluded land near the Highland Mountains to serve as the military installation for the Task Force and the UNSC coordinated its efforts to secure the area in preparation with the CMA. Over 60,000 people, including families, military personnel, and contractors prepared for their voyage to the Epsilon Eridani which kicked off in 2369. The 105th Shock Troops Division and other UNSC elements spread out elements of their troops across the ships to act as security against pirates and other threats encountered along the way. The voyage itself took nearly ten months for the Task Force to arrive at the Epsilon Eridani system.

Arriving at the system in 2370, the 105th Shock Troops Division conducted environmental reconnaissance and provided security for the logistics brigade to build settlements for everyone. The 105th HQ Battalion worked with the local CMA detachment to get a feel for the system and the current situation while the rest assisted with the building of Camp Hathcock and Independence. Following the establishment of the bases, the 105th provided security for the families moving within the walls while the rest continued to establish a defined perimeter to protect the newly build military bases. The 9th Shock Troops Regiment assisted at Tribute as the 19th Shock Troops Regiment protected Circumstance. As Task Force Voyager battleships formed two patrol battlegroups, the 2nd Shock Troops Battalion of the 2nd Shock Troops Regiment took the first rotation as the rest continued with building, ground security, and humanitarian assistance.

Throughout the rest of the 70s, the 105th Shock Troops Division built their numbers to add more assets to their numbers, conducted capability exercises with the armed forces and trained the CMA in conducting operations. Being stationed on Reach, the 105th forward deployed two battalions to Tribute and Circumstance to act as a Crisis Response Force, while another served aboard ships to conduct counter-piracy and interdiction operations for six months. In the later part of the decade, the 105th served as personal security details to CAA liaisons to ensure their protection throughout their travels within the system. At the start of 2380, Task Force Voyager began to disband as the UNSC formalized many of their unified commands among the system's space and occupied planets.

Epsilon Eridani Conflicts
In early 2393, elements of the 105th worked alongside ONI Section One to track environmentalist movements who opposed the terraforming of Reach and Tribute. Other movements included unfair land, rights, and wealth distribution conducted by the local governments of each major region, leading to protests, strikes, and riots. The movements had spread across many other Inner Colony systems which put the 105th and other units within SPECWARCOM on alert. Piracy attacks spiked, multiple death threats against government officials and, ONI reports about hostilities nearing brought the UNSC to prepare for battle. The 105th worked with the CMA to provide training support and advisors for the detachments at first, giving a leg up to the CMA in counter-insurgency operations and keeping conflicts small. Throughout 2394 and early months of 2395, the UNSC ramped up their advisory efforts and allowed the 105th to serve as a force multiplier but with restricted rules of engagements to let the CMA lead the fight. By November of 2395, the CMA and CAA called for help and the 105th Shock Troops Division prepared to enter into the Inner Colony Wars.

The 19th Shock Troops Regiment augmented their four battalions into Expeditionary Targeting Forces with support from the Army Rangers, ONI Section One, and Aerospace Force air support to conduct operations in dismantling movements across Reach. Combat operations revolved around air superiority, putting intel analyst with the ODSTs, and capturing rather than killing. The UNSC placed its emphasis on conducting non-kinetic operations to prevent further fighting in the later years. The benefits of paid off due to the unit's ability to capture leaders and essential personnel without firing many shots. Companies from the 19th Shock Troops Regiment also augmented themselves with CMA forces in high conflict zones to relieve combat stress on Tribute, where the fighting had only broken out in small, contained areas. Planners and Operation Officers worked to wear out the fighting of the enemy before making their move, knowing that the Navy and Army had set up blockades to prevent military equipment from reaching the enemy's hands. Both Reach and Tribute conflicts continued to grow as the UNSC continued to assist the CMA with more hands-on operations.

From 2397 to 2401, SPECWARCOM designated the 105th to focus on Reach and support Combined Joint Special Operations Task Force - Reach where a Regiment was deployed to Special Operations Task Force West and South while Rangers took to the North and East. Two Battalions were assigned to each geographical region with support elements from ONI, the Aerospace Force, and the Navy. The 105th distinguished themselves in their geographical region by recruiting sources and conducting multiple operations to defeat the network established in their assigned area. Reconnaissance Platoons also became known for setting up in the enemy's backyard and providing actionable intelligence, often giving the assault force an element of surprise. Each Regiment during the time rotated every 175 days to keep troops fresh and prevent burnout. While one Regiment deployed, another focused on personal security detail and serving as the alert Regiment to respond to a crisis while the other trained forces at nearby bases.

By 2402, the 105th captured the leaders of three major movements and broke up the remaining networks, bringing an end to most hostilities across Reach. Turning their efforts toward Tribute and Circumstance, the 105th deployed to fill in the gaps of the planet's Combined Joint Special Operations Task Force to assist in shutting down the remaining movements. Throughout the rest of 2402 and 2403, the CAA began working on peace treaties, negotiating surrenders, and ending hostilities. During the time, the 105th provided overwatch for the remaining battles and served as a Quick Reaction Force if needed for the CMA command. On May 19, 2403, the movements collectively agreed to surrender which brought the 105th in to oversee the surrender of weapons, military supplies, and detaining anyone who resisted.

The Epsilon Eridani Treaty brought peace to the system and allowed the 105th Shock Troops Division to showcase their ability as a recognized fighting force for the UNSC Marine Corps by 2307. For the next three years, the 105th focused on preventing any movements from popping up as the governments for each planet got their bearings. The division saw a troop growth and activated the 26th Shock Troops Regiment along with adding more units to enable the active-duty regiments. In the nine-year conflict, the 105th suffered a 25% casualty rate while over 50% of those deployed had received a Purple Heart. Along with their actions, the Unified Earth Government awarded the 105th Shock Troops Division a Presidental Unit Citation for their actions during 2397 and 2401. Many historians considered the end of the Epsilon Eridani Conflicts to be the first step for the 105th Shock Troops Division in becoming one of the best Divisions for the UNSC Armed Forces.

Operation: ODYSSEY TURBULENCE
In 2431, ONI Section One and Three along with the 105th joined together under NAVSPECWAR Group 105 to conduct covert Counter-Insurgency and Terrorism operations across FLEETCOM Sector One Inner Colonies. The plan revolved around two Shock Troop Regiments deploying to newly colonized systems to prevent safe havens for enemies fleeing from the fallout of the Inner Colony Wars. Within the UNSC, the force became known as the Counter-Terrorism Tracking Force to take an initiative in preventing hostilities from breaking out again. The force focused on nearby systems that were easy to reach since they wanted to act swiftly once inside of the systems. The UNSC Navy and Aerospace Force provided transorbital Intelligence, Surveillance, and Reconnaissance to help the Force pinpoint suspectable spots to further study once they had troops on the ground. The 19th Shock Troops Regiment deployed to the Asimov System while the 26th Shock Troops Regiment arrived at the Anu System by the end of 2431.

Throughout 2432, both Regiments participated in the capture or kill of numerous leaders that declared war against the CAA and UEG. The Force established Covert Compounds to set up close to enemy activity and have a place to store prisoners they detained during raids. Supporting the local CMA forces, the NAVSPECWAR group build target profiles and participated in raids to prevent the enemies from getting anything they wanted. The CTTF in both systems provided options for the UNSC to wipe out threats before the enemy had a chance to move, leading to an increase of missions, personnel, and a broader range of targets to go after. As ONI continued to build networks of sources to feed the Force intel, the action arm spent their time tracking and capturing people to interrogate. Such methods gave the Force actionable intelligence for the 105th and Section Three to launch more raids against the enemies. By 2434, the Force had contributed to deterring 57% of terrorist activity while also preventing such movements from popping up again. However, those who were not captured began fleeing towards the Outer Colonies which slowly became a haven for like-minded people.

The operation then set its scope on 61 Virginis and 61 Urase Majoris system where ONI Section One elements tracked fleeing targets to the systems in search of refuge. By 2436, the 105th rejoined the Counter-Terrorism Tracking Force with two Regimental Combat Teams to assist the CMA with taking down sanctuary camps across the colonies. Due to the desire of the CMA wanting to take the lead in operations, the UNSC conducted its own missions which brought disagreements among commanders in both organizations. Working around politics, the 105th worked with Section One on infiltrating into the sanctuary cities and identifying key leaders to remove. After identifying leaders, capture platoons moved in to take away the leaders which led to the disbandment of many cities where more people fled towards the Outer Colonies. In 2441, the 105th succeded in taking down a number of threats and turning their attention more towards the fringes of Outer Colonies space.

For the rest of the 2440s, the UNSC continued to maintain a presence around the Inner Colonies near Sector One while the 105th and CTTF deployed to systems with the most activity. Reconnaissance Platoons from the deployed Regiments augmented themselves with Section One and deployed to the Outer Colonies where they gathered intelligence on movements of enemies and activities. Most of the platoons that deployed worked in two to three-person teams with ONI counterparts and spent the majority of their time on Non-Official Cover rosters to protect their identities. The rest of the Regiment spent their time cross-training with the CMA and conducting missions. In 2452, the UNSC declared Operation: ODYSSEY TURBULENCE a success and quietly ordered the 105th to focus on deployments to the Outer Colonies.

Operation: FREQUENT TUNDRA
Following the end of Operation: ODYSSEY TURBULENCE, ONI Section One and the 105th formed a Special Reconnaissance Project named Juliet-37 Task Group under NAVSPECWAR to conduct covert reconnaissance in the Outer Colonies. The Project's goal was to build better target profiles against Targets of Interest around the Chi Eridani and 68 Eridani system based on the growing number of havens and sanctuary communities propping up. In 2453, Section One recruited reconnaissance platoons from the 105th and combined forces to build covers and trust among the two organizations working together. The teams began deployments to the two systems under the cover of merchants in 2454 and began their year-long missions of gathering intelligence.

Both systems proved to be hotbeds for terrorist activity and J-37TG spent little time waiting as they created profiles for TOI in their assigned systems. Mapping out the networks and building sources allowed the Task Group to understand the operational level of the enemy and its activities. In 2457, Section Two joined the Task Group where they began a program to conduct covert political and economical tampering as well as spreading propaganda. The 105th focused on infiltrating military arms of the organizations to understand their capabilities and conducted sabotage missions while also assisting Section One missions. Demolition and Snatch missions became the norm for the 105th as well where they continued to act covert and often outside of military law. Their findings located other cells throughout Sector One Outer Colonies and Inner Colonies, which led to stopping terrorist attacks on growing colonies. By 2468, the Task Group set their eyes on the Eridanus system where the UNSC and CMA had the least amount of intelligence on.

In 2469, the Task Group began year-long long-range reconnaissance missions throughout the Eridanus system. For the next twelve years, the Task Group built profiles on TOIs, networks, connections between the organizations, and embedded with the local CMA forces. Finding that the terrorist groups infiltrated the CMA throughout the system, the Task Group began covert investigations against compromised units and began tracking their activities. After building and maintaining sources, the Task Group informed the CAA and UNSC of their findings but chose not to act till given a green light. The database within the project became known as the Providence Database among targeting officers and analysts. After receiving a green light from the Task Group Commander, the units began snatch-and-grab missions along with targeted killings to prevent future infiltrations. In 2481, Operation: FREQUENT TUNDRA ended when the 105th Shock Troops Division requested for their reconnaissance platoons to rejoin their original postings and support the Division more.

Operation: SCORCHED SERPENT
UNICOM declared its first counter-terrorism operation for Sector One in 2473 to combat the growing threats of terrorism along the border of Inner Colony space. The 105th Shock Troops Division became one of the many premier forces from SPECWARCOM to conduct counter-terrorism missions alongside the UNSC Aerospace Force, Army, Navy, and CMA forces. Conflict rose throughout the 105th learning they were not going to be pushing into the Outer Colonies to put down more serious movements. Receiving intelligence from Section One's Juliet-37 Task Group, the 9th and 19th Shock Troops Regiment deployed while the 105th Space Assault Battalion and 105th Force Reconnaissance/ODST Battalion supported the two Regiments on deployment. With a rise of freighter hijackings and space vessel seizures, the 105th Space Assault Battalion prepared themselves for their first combat deployments.

In 2475 and 2476, the 105th Space Assault Battalion conducted two Visit, Board, Search, and Seizure missions aboard the Summer Tuesday and Running Martian after the UNSC Department of Commercial Shipping reported suspicious activity. ONI and the 105th tracked the situation to learn they had been hijacked by terrorists and heading towards Inner Colony space. Since the 105th Space Assault Battalion often had platoons deploy with a MEU's ODST Special Purpose Force, the 105th Space Assault Battalion Command and Control assisted the MEUs with executing the two raids. Breaching onto the ships and using zero-gravity to their advantage, the platoons took down the hijackers quickly, secured the hostages, and cleared the rest of the ship to ensure there were no stragglers. Following the success of the two raids, the 105th Space Assault Battalion became one of the renowned units for combatting terrorism aboard ships and in zero-gravity situations.

Throughout the rest of the decade, the 105th Force Reconnaissance/ODST Battalion conducted several operations under NAVSPECWAR from close-target reconnaissance to direct action missions. Since the battalion also deployed in the ODST Special Purpose Forces of a MEU, elements became notorious among the Navy and Marine Corps due to their ties with the 105th Shock Troops Division. In 2479, the Battalion rose to fame during a 38-hour firefight against a terrorist compound while being cut off from friendly forces for over 18 hours. As a result of the long firefight, many people across the UNSC Armed Forces found the 105th Shock Troops Division rising to fame for carrying out some of the hardest battles and operations both NAVSPECWAR and SPECWARCOM had in Sector One.

From 2480 to 2483, the four Regiments of the 105th rotated through the Outer Colonies to carry out direct action missions in the Theta Ursae Majoris and Chi Eridani system. Utilizing actionable intelligence from J-37TG, the Regiments were able to conduct effective missions alongside UNSC Army Rangers and ONI Paramilitary Units. SPECWARCOM designated the units under Task Force 717 where they were able to carry out both covert and clandestine operations in support of the UNSC agenda. As more targets fled to the Eridanus system, the 105th Space Assault Battalion intercepted the fleeing vessels and arrested the individuals on-board. But SPECWARCOM was not yet ready to push into the Eridanus system despite the overwhelming evidence gathered from ONI and the 105th. By 2483, the UNSC and SPECWARCOM called the end of Operation: SCORCHED SERPENT and claimed the counter-terrorism operation a success. However, they failed to realize that a much larger threat was growing on the horizon that they could've dealt with during SCORCHED SERPENT.

Insurrection
In 2492, following the bombing of Far Isles, the 105th Shock Troops Division forward deployed the 26th Shock Troops Regiment in preparation to intercept any terrorists that attempted to attack the Inner Colonies. SPECWARCOM designated a Task Force named the Counter-Secessionist Operations Task Force on Reach to capture or kill leaders of secessionist movements. The 19th Shock Troops Regiment deployed onto Reach to investigate the People's Occupation alongside ONI Section One as part of the Task Force. Not long after, the 105th Light Armored Reconnaissance Battalion saw action against the People's Occupation near Szolnok and decimated the cell where they killed 17 and captured 32 total terrorists. The UNSC supported what SPECWARCOM was doing on Reach and prepared to replicate the same actions in the Outer Colonies where secessionist movements were rampant. While the UNSC prepared for their invasion of the Eridanus System, the 105th Shock Troops Division prepared to bring back Expeditionary Targeting Forces alongside ONI Section One to swiftly take down the movements in 2493.

UNICOM and NAVCOM launched a joint-operation to combat the secessionist movement in the Outer Colonies. The 105th Regiments deployed with SPECWARCOM to the Eridanus system to conduct ground special operations while the 105th Space Assault and Marine Force Reconnaissance/ODST Battalion deployed with NAVSPECWAR to support VBSS and supply line protection for the logistic elements. The UNSC established Sector One - New Constantinople (Forward) where the 105th Shock Troops Division forward-deployed one Battalion of Shock Troops to serve as a Commander's Crisis Response Unit to respond to a threat. Due to the CMA being unreliable after being infiltrated by secessionist spies, the 105th began building relationships with conventional Marine and Army units to serve as support for missions. Building their relationship with ONI Section One more, the 105th augmented select units to conduct covert operations in support of both SPECWARCOM and NAVSPECWAR.

Throughout the final years of the 25th century, the 105th performed several capture-or-kill missions against the secessionist movements where they dismantled cells throughout Eridanus II. With help from ONI Section One, the 105th had access to an unblinking eye on secessionist movement and were able to launch missions against targets and their network. Many of the 105th deployed alongside Marine fixed-wing squadrons and Armored Units to swarm targets quickly with overwhelming firepower and the element of surprise. Utilizing Marine Corps elements made many of the 105th personnel feel better since they were working with people who went through the same training basic qualification training as them. In the wake of the 26th century, the 105th performed over 500 special operation missions since they entered into the Insurrection.

In a UNSC HIGHCOM report, the 105th Shock Troops Division was one of the most deployed units in the Insurrection campaign. Relationships with the conventional troops drove more to try out for the Division and allowed for more in-house operations in the Marine Corps. The Division continued to conduct special operation missions against Insurrectionists on Eridanus II and Mamore. Following a nuclear bombing on Mamore at a Haven arcology that claimed over two million lives, the Division set their sights on the Freedom and Liberation Party using joint ODST/ONI Hunter-Killer Teams to track down those responsible and ensure the dismantling of the party. During visits from senior political and military leaders, the 105th served as personal security details to ensure the safety of each individual who toured a hostile planet in Sector One.

After the declaration of Operation: TREBUCHET, the UNSC supplied more assets to the hunt against Secessionist movements and secretly enabled the 105th to conduct more operations across the colonies. The 105th saw a spike of 150% in their operational tempo and began delivering anybody with Insurrectionist ties to ONI. Assigned under the Combined Forces Command Special Warfare Component Command for both Eridanus II and Mamore, the 105th deployed Regimental Combat Teams to enable their units to conduct missions quicker and efficiently. At one point, the 105th set up their detention facility to conduct interrogations and gather actionable intelligence against targets. The 105th continued to push up against the Secessionist movements and destroyed cells as they began locating top officers and leaders in the United Rebel Front and FaLP.

Following a bombing on Tribute in 2524, the 9th Shock Troops Regiment deployed to support ONI in locating the terrorist cell and taking down anyone who supported the attack. The 105th Space Assault Battalion assisted in the investigation of the National Holiday cleanup in the same year and increased its efforts of VBSS operations. Following the end of Operation: TALON, the UNSC declared the Insurrection dead on Eridanus II and the 105th began returning to Reach in preparation for their next mission plans against Mamore. However, another conflict broke out in the Outer Colonies of Sector Two which led HIGHCOM to order the 105th Shock Troops Division to prepare for deployment to Harvest.

During the Human-Covenant War, an ONI and ODST unit deployed as military liaisons to negotiate terms of ceasefire due to the war. The 105th served as protective security details for the ONI officers and withdrew from combatting Insurrectionists by 2529. As the worlds that held secessionist movements and members fled to the Inner Colonies, the division worked closely with ONI teams to snatch up and prevent any secessionist movement from breaking out during the Human-Covenant War.

Human-Covenant War
In 2525, the UNSC came in contact with the Covenant on Harvest, and the 105th Shock Troops Division was ordered by Sector One Command to prepare for a Sector Two deployment. The Division cited their inability to respond quickly to the threat since they were focused on Sector One Outer Colonies and needed to focus on the Insurrection. Meeting with ONI officers throughout 2525, the 105th learned about the Covenant and fall of Harvest. Planners and Operations Officers began working on ways to put ODSTs into the fight and contain the threat. Three Operations Officers created the 105th Fleet Marines Special Operations Expeditionary Warfighting Doctrine in late 2525 as a means to augment ODST Companies and Battalions into Marine Expeditionary Units, Marine Expeditionary Brigades, and support Marine Expeditionary Force missions. The Commander of the 105th pushed for Special Operations Force Marine Expeditionary Units to support the battle after receiving the warfighting doctrine.

Following the breakout of the Human-Covenant War in Sector Two, the 26th Shock Troops Battalion came into contact with the Covenant in 2528 on Hat Yai and received a 37% casualty rate. Throughout the rest of the decade, the 105th deployed units to support the battle in Sector Two while deploying against Insurrectionist movements in Sector One. With the Covenant opening another front in Sector One at the start of the 2530s, the 105th worked to defend the colonies by deploying Special Operations Force MEUs. The 9th Shock Troops Battalion was reinforced with A Company of the 9th Shock Troops Support Battalion went Missing in Action in 2531 and was considered the greatest loss in the 105th at the time. The Battalion was quickly replaced with new members and deployed to fight against the Covenant in the Outer Colonies. Elements of the 105th participated in battles against the Covenant in the following fronts: Eridanus II, Fractus Asteroid Belt, Eirene, August II, and, Rampart where they sustained a 68% casualty rate, forcing the 105th to call upon reserve forces. Elements of the 105th assigned to an ODST Special Purpose Force participated in the Metisette Conflict.

By 2536, the ODSTs began working in a joint Section One and Three program known as the Hoplite Program to pair SPARTAN-II program operators with ODSTs to conduct operations against the Covenant. The Prowler Corps worked with the 105th Space Assault Battalion to support Operation: HYPODERMIC and Section One created the Intelligence Expeditionary Force alongside the 105th to investigate and track Covenant movements and attack supply lines. The Division increased recruiting and brought reserve forces to support the fight against the Covenant. Since the 105th remained on Reach and were not able to forward-deploy units to anticipate an invasion, they turned their attention to disrupting supply lines while rotating units through MEUs, MEBs, and MEF deployments.

Throughout the 2540s, elements of the Division participated in the battle of Miridem, Alluvion, Sargasso, Minab, Camber, and Roston. While the operational tempo slowed down, the 105th sought ways to prevent the Covenant from invading the Inner Colonies further. The Division was averaging a 60% casualty rate per battle against the Covenant and were struggling to keep their numbers at full strength, forcing them to recruit law enforcement officers and from colonial militias. Colonies such as Sigma Octanus IV and Reach began fortifying their system defenses while the Division continued expeditionary deployments to Sector Two and Four to support combat operations. The 105th Space Assault Battalion continued to conduct interdiction missions of Covenant supplies but sustained combat casualties on each mission. The 105th Shock Troops Engineer Battalion worked with ONI's Watershed Division and Materials Group to create better armor to protect ODSTs against Covenant weaponry. Within the Division itself, there was a sharp increase in Post-Traumatic Stress and suicides which the command brought in UNSC Medical Corps professionals to test and evaluate the ODSTs that were at-risk.

In the final years of the Human-Covenant War, the 105th participated in the Battle of Ariel, Reach, and Tribute. During the Battle of Reach and Tribute, the 105th deployed the entire division to the two planets along with elements to Circumstance. Already stretched thin in the Epsilon Erandi System campaign, the 105th was able to coordinate and mount many offensives against the Covenant. Fighting across the colonies of Reach and Tribute, the 105th sustained a 71% casualty rate by the time Reach fell to the Covenant. An element of the 105th that deployed with the Pillar of Autumn participated in the Battle of Installation 04 where they were wiped out. Another element attached to the 26th Marine Expeditionary Force sustained a 91% casualty rate during the Battle of New Jerusalem. The 105th relocated to England and prepared for the defense of Earth and the Sol system following their new orders from HIGHCOM and the Security Council. The 2nd and 9th Shock Troops Regiments remained on Earth while the 19th and 26th forward deployed to Mars and Luna; the Space Assault Battalion deployed to the Jupiter moons while the MFR/ODST coordinated their missions with nearby MEU and MEB units.

During the battles throughout the Sol System, the 105th deployed all units in the fight on Earth, Luna, Mars, and Jupiter's moons. There, they engaged the Covenant on all fronts under the Sol Unified Special Warfare Component Command. Elements of the 7th Shock Troops Battalion participated in the Battle of Installation 04 where they were nearly wiped out. Fighting continued throughout the SolCore where the majority of operations took place on Africa, reconnaissance teams worked in the area and averaged a near 85% casualty rate. The Light Armored Reconnaissance Battalion were dominant across Luna as they conducted hit-and-run tactics against Covenant ground vehicles. Following the Battle of Voi, the 105th repositioned themselves around Earth and the remaining colonies to fend off the Covenant invasion. A Special Operations Command and Control along with two combat teams deployed to assist the Battle of Installation 00, the element sustained a 90% casualty rate. Following the death of the High Prophet of Truth, the UNSC began taking the upper hand against the enemy and won back Sol System.

Following the end of the Human-Covenant War, the 105th was nearly destroyed at an organizational level due to the number of casualties. The Division became the most decorated Shock Troops Division for their actions on the Installations and countless engagements against the Covenant. During an awards ceremony, there were fourteen Colonial Crosses awarded to ODSTs for their actions in the war, only one was able to receive it in-person. Other awards included the Legion of Honor, Navy Cross, and Silver Stars; often being awarded multiple times. The Division Commander wasted no time and began rebuilding the 105th, briefly placing the 26th Shock Troops Regiment on reserve duty while working to rebuild the other three Regiments to full strength. The division and Medical Corps began monitoring the mental and physical health of ODSTs to ensure they did not lose more to suicide.

Rebuilding and Relocation
In the wake of the end of the Human-Covenant War, the 105th launched the Comet Project to rebuild the division. Residing at the Marine Corps Base Camp Pennefather, the division launched continuous training along with assessment and selection cycles. Select reconnaissance teams paired with the Prowler Corps began missions to scout out a new training facility for the division 2553. Another combined Ranger/ODST/ONI unit began searching for the 9th Shock Troops Battalion who went MIA in the early years of the war as well by late 2553. The Division Staff published a new doctrine making the unit become a hybrid force for SPECWARCOM and NAVSPECWAR in the event of their deployments. Meaning units deployed were capable of performing both SPECWARCOM and NAVSPECWAR operations assigned to the designated deployed unit, giving the division more opportunities to conduct missions and not be restricted to one unified command. By the end of 2556, the 105th placed the 26th Shock Troops Regiment back on active duty.

Underlying issues in mental health and abuse rose dramatically during the stand-down of the division. Divorce rates and spouse abuse skyrocketed along with depression, PTS, night terrors, insomnia, and suicide. Members who retired from the division formed the 105th Helljumper Association to assist the active-duty ODSTs in rebuilding their lives. New members of the division were constantly harassed by the older members and left before they had a chance to deploy. The command launched an internal investigation to learn 92% of the new members to a Shock Troops Regiment were hazed and went after the ODSTs to encouraged the acts. Other ODSTs who became addicted to drugs and alcohol were thrown out while also being placed into a rehab center. An element Medical Corps and 105th launched a campaign to assist ODSTs with their mental health, marriages, and anything else on the medical side.

In June of 2554, the Division was given the green light to ship to Tribute and move to their new posting, Marine Corps Base Camp Saipan in Sector One. During the construction of the 105th Headquarters, they cataloged every ODST who was killed in action and became known as the Black Book among the people. Training Facilities, Barracks, and Armories were named after ODSTs who were awarded Colonial Crosses to honor those who rose above the call of duty to allow Humanity to have a fighting chance. By December of 2554, the 105th Shock Troops Division had one fully staffed Shock Troops Regiments ready for deployments on Tribute. The rest of the division settled on Tribute by the end of 2558.

Operation: INHERENT STANDARD
During Project Comet, the division joined a SPECWARCOM Colonial Project known as the Colonial Advisory Support Element Force, Sector One. The project was known to augment ODST Shock Troop Battalions, Companies, and select Combat Teams to assist corporations in security throughout the Inner and Outer Colonies. The 2nd Shock Troops Regiment supplied units to colonies with multiple conflicts as a means to assist with training, educating, and advising corporate security divisions throughout 2555. The division put together an Expeditionary Intelligence Unit with ONI to conduct reconnaissance, surveillance, and observation missions in the Outer Colonies of Sector One to gather information. Due to the fall of the UEG, the 105th continued to monitor the at-risk colonies and provided non-lethal alternatives to bring them into the Phoenix Initiative.

CASE Force, Sector One became heavily active due to the strong opposition of corporations working in the Outer Colonies. As corporations launched covert campaigns against the people, the CASE Force worked with the local government and corporation to prevent further breakouts. During a meeting between Mamore government representatives and the CASE Force in 2557, a bomb went off and killed both parties. Attacks from both sides were launched in a covert manner and Venezia began descending towards a conflict till the Phoenix Initiative stepped in. The government ordered all CASE Forces out of the Outer Colonies, but the UNSC regional command rebranded the unit as Sector One Augmentation Teams and reinserted forces to track down those who bombed the meeting. The 105th was successful in apprehending the terrorists on Carrow, but their actions strained the relation between Sector One Outer Colonies and the Phoenix Initiative further.

Throughout the 60s, the Sector One Augmentation Team missions were handed off to conventional units as the 105th began turning their attention towards ex-Covenant splinter factions and Insurrectionist activity.

The 105th deployed a force to the Soell System as Technical and Reconnaissance Advisors beside the Concord of Reconciliation. In 2555, elements from the 2nd Shock Troops Regiment, 3rd Shock Troops Battalion participated in a battle against Jiralhanae Loyalists over Alpha Halo. Following the end of the battle, UNSC High Command ordered Sector One to work with the Concord on securing and maintaining security of the Soell System.

In 2556, the 105th stood up a sub-operation known as Operation: INHERENT STANDARD - Comet Shield to assist in locating, targeting, and denying alien operations throughout Sector One. The 105th Space Assault Battalion augmented themselves with civilian and military vessels to conduct counter-piracy missions. A joint ODST and ONI unit formed the Joint Xeno Tracking Force - Sector One to gather information on alien activity and providing plans to take out their positions. The two missions continued on throughout the rest of the decade as the UNSC Navy rebuilt their fleet. During Operation: INHERENT STANDARD - Comet Shield, the 105th ran a joint special operations capabilities exercise to simulate a Covenant invasion of Tribute and ways to effectively respond in 2560.

Soell System Patrols
In the wake of the Battle of Alpha Halo in 2555, Sector One began patrolling the Soell System with the Concord. The mission became known as Operation: AUTUMN'S REST in honor of the UNSC Pillar of Autumn. Other memorials were dedicated to the 28th Shock Troops Battalion (Reinforced) and the Pillar of Autumn's crew. The 105th began rotating battalions to support the full-time security of the system. The three major forces and their tasks included Study and Analysis, Security, and Training to assist the full-time personnel from the UNSC. A Command and Control was placed into the system by Sector One known as Combined Joint Task Force - Soell System and oversaw all UNSC operations in the system. The area became known as Joint Occupation Zone - Soell System and was the first interspecies operation along with the Concord for the 105th Shock Troops Division.

The Study and Analysis Force became well-known for its reconnaissance of Alpha Halo and preparing strategic responses to the arrival of another Halo Ring. Working with personnel from ONI and the Army Rangers, the 105th ran numerous teams around Alpha Halo to help generate combat simulation sequences to help planners study and prepare missions. Security Forces broke into two cells known as Black and Yellow, Black Cell focused on breaking through UNSC bases while Yellow spent their time improving defenses. The Security Forces ran numerous simulations to figure out how to prevent infiltration all the way to full-out assaults they saw during the Battle of Alpha Halo.

Recruitment
The Division recruits from all branches of the UNSC Armed Forces, but the majority of their candidates come from the UNSC Marine Corps and UNSC Navy. Recruiters for the 105th are both enlisted and officers who can travel and recruit members from other units. The basic requirement is for a candidate to have one rotation with a military unit under their belt along with a basic physical test to ensure they can perform well in assessment and selection. During the process of recruitment, the 105th actively seeks officers and enlisted personnel. Officers at the rank of O-2, O-3, and O-4 are the only three ranks that the division selects from in their candidate pool. Warrant Officers at the rank of W-1, W-2, and W-3 are the only three ranks where Warrant Officers can apply to join the division. Enlisted personnel at the rank of E-3, E-4, E-5, E-6, and E-7 make up the majority of the pool. It is not often to see candidates outside of the candidate pool apply for the 105th unless they receive a medical waiver and go through an extensive physical test to ensure the candidate can perform the tasks.

Assessment and Selection
The Assessment and Selection program, better known as Selection among the training cadre, is a three-week-long program that looks for the right candidates. The first phase is known as the physical test that looks at the candidate's physical strength, toughness, and ability to perform combat maneuvers. Only getting four hours of sleep, candidates are pushed to their limits so that the cadre can see the true characters of each candidate being assessed. The physical week is the one section where many candidates washout and voluntarily withdraw; it has been noted for being one of the hardest weeks among training cadres in the UNSC Marine Corps. The physical week also serves as a baseline for each candidate, telling the cadre where the candidate is not strong and looking for ways to improve it soon.

The second phase is known as the academic, which is a week-long section focused on the candidate's intelligence, mental resolve, and critical thinking skills. From classroom lectures to psychology exams, the medical staff of the cadre is looking to see if candidates can think during a high-stress situation and command fellow troops. The physical intensity is dialed down to let the candidates focus more on their academics, but wants to keep the body weak to ensure the medical staff can make an accurate assessment. After an academic week, the final week includes an oral board and a final physical test to determine if the candidate should be in the 105th Shock Troops Division. Interviews are held by the senior and command staff of the cadre to determine the true fate of the candidate. After passing Selection, candidates move onto ODST Qualification Training.

ODST Individual Training Course
The 105th Individual Training Course is a three-month-long course focused on developing a candidate's fundamentals in fitness, tactics, combat techniques, and mental toughness. After candidates pass through Selection, the intensity of training is more focused on the mind of the candidate rather than their ability to reach time limits and status quo. The ITC pushes to help develop candidates into capable ODSTs that can conduct a range of missions within a Drop Jet Platoon. In the Fitness Section, the training focuses on hand-eye coordination, teaching candidates to become more endurance, and taking care of their bodies. Medical Officers from the training cadre teach health courses and assist the candidates by employing tactics throughout their training. The Tactics Section educates ODSTs on basic Shock Infantry techniques and developing plans to conduct special operation missions. Members from the 105th and ONI Section One teach ODSTs how to read maps, tell time without watches, navigate areas, create plans in a small team and, execute tasks throughout several environments. Tactics lead right into Combat Techniques, which then helps the candidates stimulate what they learned in tactics and add a combat element. All of the candidates learn field skills such as Survival, Evade, Resistance, Escape, Tactical Combat Casualty Care, Fire Mission Support, and Communication Techniques. The Final Section, known as Mental Toughness, runs the candidates through a test to see if the candidate can perform the tasks they have learned throughout the ITC. Often put against the training cadre, the candidate is forced to use all of the knowledge he accumulated in three months to pass through the final test. After passing the ITC, the candidate becomes an ODST and earns a spot at the ODST Troop Training Phases to join a Drop Jet Platoon.

Phase One
Known as the Small-Unit Tactics Phase, the two sections focus on fireteam and squad tactics with candidates to determine how they work together. The first section consists of fireteam exercises where the candidates learn how to conduct missions in a small team of four personnel. Emphasis is placed on building trust and respect among those in the fireteam to execute complex special operation tasks under stressful scenarios. The Fireteam section includes live-round exercises such as room clearing, maneuvering on targets across various geographical lands, and honing skills as a team. Other exercises include the usage of tactical training rounds to stimulate fireteam battles better with the help of the 105th ODST Combat Training Unit. The three-week-long section builds into the squad section which brings in another fireteam to build trust and comradery with other ODST candidates. The squad section lasts another three-weeks and ends with the new squad preparing for Phase Two.

Phase Two
The Platoon and Company phase of ODST Troop Training allows candidates to train within an ODST Drop Jet Platoon; candidates continue to perform stimulated special operation missions with the platoon. The Platoon section of ODST Troop Training is the first time ODST candidates can interact with active-duty members of the division. The two-week training period gives time to the platoon to assess and educate the new candidates on how to employ their training. Following the end of the Platoon section, new candidates have joined the 105th Shock Troops Division and prepare for the Company Section. By the Company Section, the five platoons are working together to stimulate combat operations along with doing work-ups for the next deployment. Company exercises include stimulated shock infantry maneuvers, conducting missions with various elements, and using critical thinking to produce effective plans in a short amount of time.

Phase Three
Battalion and Regiment training come in last, they are considered the last Phase for a newly-minted ODST before deployment. The Battalion section focuses on four companies working together to conduct special operations for the UNSC Marine Corps. Battalion troop training includes wargaming against other battalions within the division and, participating in joint capability exercises with the UNSC Army. Battalion training is often done with a variety of units within the Division to keep ODST skills sharp. The Regimental Section is the last and final section of ODST Troop Training, which focuses on a full deployment of a Regiment. Training largely reflects what's done during the Battalion section but heavily focused on the geographical terrain as to where the Regiment is deploying. The Regimental Section is conducted one-week till deployment and ensures that all ODSTs are prepared for their deployment.

Advanced Training
The 105th Shock Troops Division encourages ODSTs to continue attending courses and schools to become better fighters and thinkers for the Division. Many ODSTs attend schools within their assigned MOS to become more skilled and specialized while others build themselves up as well-rounded service members. The Marine Corps Special Operations Command holds several courses and schools to give ODSTs a variety of options to choose from, such as advanced special reconnaissance, master breacher, assaulting, and advanced driving courses. The UNSC Aerospace Force often trains ODSTs in combat medicine, conducts Search and Rescue Capability Exercises, qualifies Joint-Terminal Attack Controllers, and simulate transorbital operations for Space Assault Battalions. ODSTs often attend SERE Courses through the Aerospace Force due to their dedicated SERE's program. The UNSC Army offers a host of schools that range from Reconnaissance and Surveillance Leaders Course, Ranger School, Long-Range Target Interdiction, Advanced Reconnaissance, Target Analysis, and Exploitation Technique Course. The UNSC Army often assists with providing crucial special operations educations to ODSTs to ensure they have a strong background in their field of expertise. The UNSC Naval Special Warfare Command provides a wide range of maritime, EVA, individual skills development, and vessel boarding techniques such as the Naval Special Warfare Sniper School, Advanced EVA tactics, and close-quarters battle aboard ships.

The Office of Naval Intelligence Section One assists with training ODSTs in intelligence and target identification along with helping select ODSTs become case officers. Section One also assists in teaching ODSTs how to operate undercover and ways to produce actionable intelligence, giving students the best chances to gather the best information for fellow ODSTs in their company. Officers who attend Section One courses can often serve as a liaison officer later in their career and become a spy handler within the Division during deployments. Section One courses and schools are considered the most elite where veteran ODSTs attend after spending a number of years in the Division.

Culture
Known as one of the best fighting forces in the UNSC Armed Forces, the 105th Shock Troops Division is known for its aggressiveness and intense focus to conduct combat missions. Since the 105th has predominantly operated in the colonies, the unit was the center of attention for controversies that involved the treatment of prisoners, suspectable war crimes, and scandals within the unit. Many historians looked at the history of the 105th and other units, finding they were the same issues among many Marine Divisions. The only difference was that the 105th received more fame since they were located on Reach. Many senior officers and enlisted personnel claimed the division to also be HIGHCOM's unit, which later proved to be false. Then, the critics shifted to ONI since the 105th worked much more closely with Section One and Three during the Human-Covenant War.

ODSTs inside of the 105th wanted to be there since they knew they were going to get the big missions in Sector One and Three. All of the units inside of the Division have been recognized for their success in battle, most notably the Shock Troops Regiments and the Space Assault Battalion. At first, the division was known as an overflowing fraternity house where ODSTs showed off to their peers how good they were. The Command took a strong-arm approach to the perception and taught their ODSTs on the importance of being silent professionals and seeking no recognition for their work. To support the newly found perception, any ODST from the 105th who spoke about his service to gain a profit was labeled persona-non-grata and not allowed to attend any reunion events. Following the end of the Human-Covenant War, the command created The Black Book to remember all those that had lost their lives while serving in the Division.

Officers who progress their career within the division, often go on to serve in some of the most notable Special Operation Commands there are in the UNSC. An overwhelming amount of officers are often slotted to serve in liaison command positions within their assigned Sector, NAVSPECWAR, SPECWARCOM, and ONI due to their knowledge of working joint operations. Enlisted personnel who stay inside of the Division for their career are known for being some of the smartest ODSTs due to their pursuit of academic knowledge mixed with an operational background on colonial conflicts. The relationship between the enlisted and officers remained extremely relaxed throughout its time, emphasizing a decentralized command and having trust in those on the ground.

Stations

 * Marine Corps Base Camp Nassau (Reach, Epsilon Erandi System, Kepler Sector, Sector 1), 12 May 2370 to 05 September 2552
 * Marine Corps Base Camp Pennefather (Earth, Sol System, SolCore), 13 September 2552 to 23 June 2554
 * Marine Corps Base Camp Saipan (Tribute, Epsilon Erandi System, Kepler Sector, Sector 1), 24 June 2554 to Present