Editing Hua Yuan Exterminators (section)

==Hua Yuan Exterminator Regiments==
All Regiments raised on Hua Yuan can trace their history back to what would become the Hua Yuan 1st Exterminators. In 899.M41, following the surfacing and attempted uprising of a Gene Stealer cult, the Hua Yuan 1st Regiment became famous among the forces present for their successful engagements against the Tyranids, their familiarity with tight urban combat, and usage of unconventional tactics. Alongside the Sororitas present on the planet, they quickly assisted in beating back the infestation, and earned the nickname "Exterminators." Members of the regiment rapidly developed a hatred of Tyranids, which was only increased by some members secret use of a special Combat Stim made from Termagaunt adrenal gland which allowed them to see Tyranid warp signatures at heavy toll on their body and mind.

The massively crowded environment makes law enforcement and public order a constant issue on Hua Yuan. As a result, many of the recruits are well accustomed to violence and combat. Their temperament is rough and obnoxious, which only ever gets covered up by their extensive training in the Exterminator forces, never removed. This unique personality has led to some of the Exterminator's more cherished customs: Looting and trophy taking. Whenever they engage an enemy, whatever pieces weren't destroyed will be whisked away back home to flaunt their feats. In addition to the standard equipment, veteran guardsmen will often be adorned with Tyranid skeletal remains, pieces of repurposed tau armor (usually covered in profanity), scrap ork contraptions, and anything else they can get their hands on. Some have even looted Eldar Soulstones, incorporating then in whatever way they can.

In the aftermath of the fighting, the 1st Regiment's unorthodox tactics attracted much in the way of positive attention from Administratum and the nickname was made not just an official name for the regiment, but a unit classification as well. Their first engagement after earning this title left the Hive covered in graffiti saying "Exterminators were here".

Since, over 500 Exterminator Regiments have been created on Hua Yuan, all building upon the unique training and tactics of the 1st Regiment. These regiments are sent far and wide across the galaxy, as they have become quite the commodity in the fight against the Tyranids. In their extensive conflicts with the Tyranids, they've developed quite a number of successful tactics and techniques, tried and true.

===History and Background===
The concept of the Exterminator combat doctrine is evolution in its purest form. Before the Praetorians discovered the lonely moon, the gangs and sects ruled the hive, whilst the proto-nobility manipulated these forces against each other to maintain their power. The Exterminator practice of free-running was born in this urban crucible, sliding around the sloped sides of the burgeoning hive, and sprinting in and out of the metal labyrinth the quickest and easiest way around the wreck of the Brimstone. Once the hive blossomed in full the art of freerunning, known as Yùnxíng miǎnfèi or simply Yunyun in the hive, expanded. Some gangs are legendary for their acrobatic ability, especially in the upper levels of the mid-hive, where one can better jump off roofs and actually get some air.  The current urban fighting doctrine is also a formalized fighting style developed in the hive, where the battlefield is is not a simple plane, but a multitiered chessboard, in which the flow of battle is in constant motion. A Hua Yuanese fighter must be constantly aware of what's around them, even from above and below, hyperfocused on their surroundings. This coupled with agile troops makes for a highly reactive fighting force, never one to hold ground for long. 

The most famous aspect of Exterminator Warfare, dubbed "Color and Mayhem", was actually a product of the enforcer gangs and PDF created by the nobility. Typically gang warfare was naturally quick and violent, but without much in the way of pretense. Using concussion grenades and tear gas was the work of law enforcement. Gangers typically liked to ambush their quarry using vehicle borne improvised explosives and simple rushing assaults. The transient and quick paced flow of battle was combined with the raid style opening of combat, which ultimately co-evolved into making the battle space as usable as possible, in the Tyranid invasion.

The Genestealer cult was quietly flourishing in the bowels of the ship, then expanded even further when the hive began to grow around the wreck. By the time the PDF and gangs where finding a common enemy in something that wasn't entirely a gang or a cult, the splinter had already found them. When the hive ships, tossed into orbit by the abating warp storms and subsequently crashing, arrived in Hua Yuan. everyone that could hold a weapon became a soldier, and the line between sect, gang, and enforcer was eradicated. The unlivable atmosphere, coupled with the absolutely barren landscape forced almost all of the invasion to take place within the hive. It was here, in the event known as the Fall of Seven Walls, in which the hive was beset on all sides. The gangs, cults heretic and faithful alike, and those who upheld the law banded together to repel the Devourer. Surgical precision met chaotic and frantic fighting. The gangs taught the law the delicate art of fighting dirty, and the PDF instructed the criminal element on how to properly conduct themselves in the field of battle, and the sects provided a sense of fearlessness and ruthless fanaticism that only those who believe their souls saved could.

The Tyranid threat forced them into a cohesive fighting force, and in a surprising show of solidarity, all levels of the hive where fighting as one. The Hive Mind saw that mass formations of swarming hives was proving to be ineffective, as the humans were willing to incinerate entire Hab-Blocks to deny the swarm biomass. Forced to assimilate whole cells of the Genestealer cult in order to keep numbers up, the Hive Mind adjusted its tactics rather quickly, shifting resources from ranged bioforms to more specialized bioforms such as Lictor and Genestealer broods capable of assassinating whole command structures and carnifex broods that were capable of dismantling entire hab blocks by themselves. This change in warfare caught the Hua Yuanese off guard, and the defensive was slowly becoming dismantled from within by genestealer hybrid infiltrators and assassin bioforms.

One invention finally turned the tide of war. The genesis of this dubiously heretical Combat Stim is shrouded in mystery, but its use was the catalyst that drove the Tyranid threat into near extinction. Named Xenon after the pale glow it exhibits when it it is first made similar to the element of the same name, Tyranid Dust was used to root out Hybrid's in their ranks. Although higher generations of hybrid could escape the notice of individuals under the effects of Xenon, the use of the drug saved untold lives and prevented a plethora of assassinations that would have spelled the end of the fledgling hive. 

With Xenon in the arsenal of the most dedicated fighters, they developed the less famous style of fighting that gave them their name. Exterminatus.

The fighters realized, like so many before them, that the only way to defeat the enemy before them was by being relentless in their removal. They had but one choice; to extinguish the Tyranid threat completely, no matter the cost, no matter how. To this end the element Kaihonium was used as a cheap alternative to Holy Promethium, entire floors set ablaze with green, orange, blue, and pink fluorescent flame.

Others sealed off hab-blocks systematically and flooded them with poisons. Every time they would concocted a new breed of toxic fume, and they would unleash it upon the enemy, rarely allowing the Hive Mind to adjust to their tools of extermination. Hunting them through the hive these exterminators razed the city. When they could pinpoint a brood they would descend upon their quarry like hawks, busting into a hab-block and clearing it out of any and all life. If they could not find the source of the infestation they would simply ignite the area, or conduct horrifying chemical and biological warfare. It was an effective strategy, and soon the brood found itself with too little biomass to continue the offensive. The Tyranids fled underground, deep within the world's crust. 

The Exterminators helped rebuild and rooted out what they believed to be the last of the Tyranids. When the Praetorians finally arrived they were inducted into the Imperial Guard wholesale, the enigmatic enforcer captain Yeoh Hong forged into a commanding officer for the regiment, and one of the most famous figures in the division.

===Exterminator Company Structure===
The Hua Yuan Exterminator regiments operate in a tight structure, with companies having very specific roles both on the battlefield and off.

====Command Company====
The Command Company is the beating heart and cunning mind behind any Exterminator force. Composed of a few Vox companies and a dedicated Honor Guard to protect the command team, the Command Company is the spider in the vast web of cell like Companies that the Exterminators employ, aggregating and compiling intel compiled by the FOBs and firebases in secured locations throughout the AO and relaying orders and directing the flow of battle. 

The Command Company often operates outside the AO or in a central location relative to the AO's of the subordinate units, issuing orders via Vox, and should interference, be it atmospheric or otherwise, prevents standard communication, HQ will utilize couriers and servo skulls to relay critical orders while the companies rely on contingency plans and training to continue the mission self sufficient.

====Infantry Companies====
These companies form the backbone of any Exterminator regiment, no matter how specialized. Every infantryman in an Exterminator unit is considered the best of what the Hive has to offer, but even in the Exterminators the infantry are considered the best of the best.  These guardsmen are highly mobile, the physical fitness standards required to remain in an Exterminator regiment after conscription are one of the leading causes of Guardsmen washing out and being transferred to a Line Infantry unit, or in more severe cases Penal units, if not executed outright.

A standard Infantry Company is composed of at least five platoons, with typically no more than ten. These platoons will fall under the supervision of a Chief Sergeant that monitors and coordinates the squads within their platoon. The platoon sergeants then report to the company commander, typically a Captain, the Major Chief Sergeant, and the attached Commissar. The Major Chief Sergeant and the Captain manage their company, coordinate with other supporting companies, and report to the command or HQ element. However the role of the Commissar is to dispense judicial punishment amongst the ranks, and maintain good order and discipline when the platoon sergeants fail to do so, which usually occurs when a Guardsman succumbs to Xenon, or Nid-Dust and is deemed unfit for service. 

At the squad level a squad, or fireteam in a combat environment, revolves around the squad leader, typically a Staff Sergeant but no lower than a Sergeant (unless they die, in which case the highest ranking member of the squad will assume the position; this is typically the easiest way to receive a promotion). A squad usually has around six or seven Guardsmen, within the squad will be a variety a specialists, who train their battle buddies in their particular skill set should they die in the field so as not to cripple the team upon their death. Standard specialists within the squad consist of the medic, Voxman, designated breacher and point-man (the guardsman that performs the entrance breach in a Flash and Clear, and the first guardsman into the breached area; in more cramped situations a single guardsman can perform both roles), and the Hunter, or Xenon-boy. The hunter performs a crucial role in the squad, simultaneously a great honor and a great mark of shame upon the squad. The hunter is the designated Xenon user. While almost all Exterminators have used the malicious drug at least once, the hunter is the member of the squad that has used the drug the longest, and has thus built up a certain resistance to the most debilitating of its ill effects, but has likewise developed a crippling addiction to the vile substance. Hunters often spiral into insanity with prolonged use, viewing their squad mates with suspicion and eventually with violent fear, battle brothers slowly becoming Genestealer infiltrators in their clouded minds. Nevertheless, these Guardsmen play a vital role in routing out Genestealer infestations and preventing ambushes from stealthier bioforms, Exterminators bounding after their Xenon-boys like hunters after bloodhounds.

====Armoured Companies====
The armoured components of Exterminator Regiments serve to both ferry Guardsmen across less dense areas of the battlefield and to provide extra firepower when necessary

Armored companies share their footslogging comrade's experience in fighting urban combat, especially in tightly packed environments. Their tactics are therefore typically based upon area control, utilizing their heavy firepower and armor to block off major thoroughfares and working in conjunction with infantry to cut off pathways, allowing friendly units to shape the battle in their own favor.

As a result of the more practical tactical doctrine, Armored units are primarily made up of light armor, such as several Chimera variants, modified Centaur AFVs, Cyclops RDVs, and occasionally Tauros when fighting in more open environments. Additionally, due to the subterranean nature of Hua Yuan and most Hives, Armored units will occasionally utilize Termite Burrowing Vehicles to great effect to break enemy fortifications and (unconventionally,) to destabilize the very earth beneath entrenched enemy positions. Additionally, units will frequently utilize deployment of Sentinel units to supplement infantry movement, deploy dazzle weapons, and move into support positions otherwise inaccessible to other armored units.

====Exterminatus Companies====

====Stormtrooper Attachments====

===Exterminator Combat Doctrine===
All Hua Yuan regiments have developed their own unique doctrines, and the elite Exterminators are no exception. Relying on quick reaction times and swift operational tempos, the Exterminators offer an effective if seemingly frantic and chaotic fighting style, both in combat engagements and at the command level. 
 
====Colour and Mayhem====
{{Topquote|I'll give you some <s>fucking</s> colour to see, bitch!|Unknown Exterminator, during a raid on a [[Slaanesh]]i pleasure-house}}

====FOBs and Firebases====
An integral part of Exterminator doctrine is the use of forward operating bases (FOBs) to maintain forward momentum when clearing out a Hive. During the initial penetration of a hive and the ensuing firefights, numerous hab-blocks will be leveled as part of collateral. This freshly created real estate is the perfect environment to set up a firebase, moving light armor and light artillery into position to secure a solid point of entry and exit that the Exterminators can operate out of. Whatever the Exterminator’s preference, however, an FOB can be anything, anywhere: a tunnel system, a rooftop, a corner candy store, just reinforce it a bit, set up patrols, and move in the equipment and you're set. Normally a Hive can't allow for a legitimate firebases in their current state, so it takes some “renovations” in order to have a fully functioning one, leading to numerous complaints from men all along the administrative ladder. The hive would be divided into stratum accordingly, removing citizens and setting up firebases that they can perform quick, surgical strikes from until an area is deemed pacified. Repeat process until the entire hive is cleansed of the Imperium’s enemies. The Exterminators are quick to set up a network of bases, the rear ones concentrated around the points of entry are for command, infirmaries, supply and respite. The forward bases get setup in preparation for the next push or in pacified areas to bring supply lines forward.

The kind of operations performed out of the FOBs can be categorized in two: The Scythe and the Scalpel. When they set up a scythe, they are meant to sweep through a particular area, going block to block in the hopes of completely eliminating any enemy presence in their particular stratum. A scalpel is used when intelligence suggests high enemy concentration within a particular area, and perform surgical strikes to either secure points for other units, cut off the enemy forces and isolate them, or outright eliminate an enemy enclave. In either scenario, the operations rely on fast, heavy handed and carefully articulated plans to maximize surprise and confusion in the enemy ranks. They won’t occupy an operating base for too long, as holding a line can cause the theater to stagnate, and when Exterminators stagnate and lose momentum they begin to lose control of the AO. They like an AO to be just as chaotic as they need it to be, in ways they can manipulate. That or they want it nice and calm, or draw the enemy's attentions so they can surprise them, but a violent gridlock or a stagnating line is the last thing they want. The Line Infantry is virtually shit. They try to constantly be on the move in a strategic sense, constantly moving throughout a hive, setting up temporary bases in order to make sure nothing falls through the cracks as they progress. 

To that end, FOBs will be nothing more than staging areas with a communications company attached, parking spaces for supply transport units, and a lightly fortified command trailer. Everything will be made to be compacted down and moved ahead quickly to remain at pace with the troops advance. Medical units may be attached to these command elements, but are also forced to remain mobile, likely field surgery units set up to operate out Samaritans. Supply units follow immediately behind advancing troops, ready to prepare the next command/operations base as the AO is secured. In prolonged engagements,however, these firebases can be so ingrained and well fortified that they become permanent fixtures for enforcers and pdf’s once the Exterminators pull out and conflict ends.