The Integrators are a non-player faction T-Force can encounter after the Fall of Haven Base. They are one of the few explicitly neutral factions that T-Force can encounter out in the Wasteland and the source of upgrades to even Founder units.
The Integrators are a faction with cult-like behavior and believe that, to survive in the Age of the Machine, humans must become machines themselves. As such, its not uncommon for Integrators to adopt not only machine-like behaviors, but also to adopt the use equipment (like masks that scrambles one's voice) and cybernetics. They are also highly suspicious of outsiders but they also go out to capture humans that they can integrate into their groups (even up to purchasing slaves from the Cartel). Therefore, many outsiders consider the Integrators to be little better than the Cartel slavers.
That being said, there's a reason why the Integrators have been able to stay out of the war or come to blows with other human factions: They are a major source of advanced technology. From basic engine upgrades to ex-US military vehicles, they're willingness to sell hardware for more advanced technology, goodwill credits, or even people is something that few factions can lose access to.
History
It's unclear when the Integrators were formed or began as a movement, but their organization grew in strength after Judgment Day. While a fairly insular group, the Integrators would get their hands on a wide variety of technologies including an advanced Electronic Warfare System that can hide their main settlement from Legion eyes. The Integrators would establish a main camp Northwest Texas, south of the former city of Amarillo, becoming a major trading hub for various wasteland organizations. The Integrators also deployed various recon teams to find relics of the Pre-Judgement Day era and establish other settlements or trading outposts.
A key event for the integrators would be the discover of the Midlands curse, which would involve the loss of several Integrator recon teams to a Digital Storm based out a Prototype Battle-walker. The Integrators would seal off this zone to outsiders and advised any travelers heading to the main Integrator Camp to take alternative routes.
In addition, the Integrators would strike up a trading partnership with the Cartel, one of the largest and settled factions of the Heartlands. In exchange for a variety of advanced technologies, including weapons, captured intact Legion Spiders, and vehicles, the Cartel would provide the Integrators with slaves. It's unclear what these slaves are used for although later gameplay does show the Integrators being interested in those with advanced technical skills.
Main Campaign/Post Fall of Haven
Sometime after the fall of Founders Base Haven, the Integrators would track down and capture a Legion convoy carrying human prisoners with the intent on integrating these captives into the organization. However, at least two of these prisoners would escape sometime before the liberation of Nueva Tortuga, both former Founders members. In addition, the Integrators losses an experimental armored tank mounting a railgun system, and they put out offers for any outsiders to recapture.
The first time T-Force will hear about the Integrators is if T-Force stays and fights in Abiquiu. When provided with Goodwill credits by the Movement, T-Force is informed of the Integrators and their access to advanced technologies. T-Force has the option to travel to Taos, an Integrator settlement, which offers to trade and sell goods which includes former US military vehicles like a Bradley (which T-Force can buy using their Credits provided they have crews with tank handling experience). In addition, the Integrators will reveal the disappearance of their tank to T-Force and offers supplies and resources if they can be recovered.
An Integrator force has also been sent to the outskirts of Santa Fe looking for an advanced Active Protection System that could protection tanks from hostile missiles. T-Force has the option to assist the Integrators in recovering this APS technology from a prison occupied by armed militants hostile to anyone. If the APS technology is recovered and sold to the Integrators, the Integrators will be grateful and provide both goodwill credits and a good word of T-Force to other Integrator groups. Otherwise, this Integrator force will remain uninvolved of the large scale conflict between the Movement (support by T-Force) and Legion reinforcement convoys (they can be provoked into hostilities if player forces intrude upon their camp).
Integrators will again be seen in the Nueva Tortuga mission, having established an outpost next to a Cartel vehicle depot and fighting ring. They are shown to have been selling intact Legion spider models the Cartel use in their fighting rings (where combat teams pit themselves in destroying spiders, which is often the cause of gambling and the accumulation of spectators). In addition, the Integrators become very interested in Flinch, one of the previously escaped ex-Founder Prisoners who was captured by the Cartel, and more than willing to trade an intact Legion heavy tank for him.
How the player interacts with the Integrators will depend on play style and actions. This can include not bothering the Integrators at all or even helping to sell Flinch into their services. However, an option presented is to infect one of the Spiders in the fighting ring with a virus and forfeiting the fight. This will then cause the spider to return to the Integrator Camp and infecting the rest of their automated combat platforms, causing the virus to take control of Integrator Artillery platforms and shelling Cartel positions. This will tear up the truce between the Cartel and Integrators, causing the two to fight each-other. However be warned that if players take this route, any surviving Integrators will remain hostile to T-Force when the main force arrives.
The Integrators do not appear in the rest of the Cartel arc (barring some of their equipment and weapons T-Force can recover during a bridge seizure) but they will become an important focal point when T-Force transitions to going after the second Founders prisoner who escape Integrator custody. An Integrator force will make contact T-Force as they approach Midlands, warning them to take an alternate route to the main Integrator Camp. Once at the camp, the Integrators will reveal that a strike force has already been sent to the town of Vega to apprehend the escape prisoner and do not require external assistance.
However, T-Force can beat the Integrator Strike Force to Vega if a guide is hired (if not, T-Force will arrive when the Integrator Strike Force arrives) and makes contact with a group of Founder Deserters under one Major Kelso (the escaped prisoner). While engaging a Marauder group known as the Four Suns, the Integrators will appear from the south near the gas station and announcing that they will commence capture operations. While T-Force has the option to engage and destroy this Integrator Force, peace can be made when Kelso reveals that they have the missing Integrator Tank (an old M4 Sherman mounting a massive Railgun) mentioned from the Taos crew. If properly hijacked, T-Force can bargain with the Integrator Task Force to exchange the Tank for Kelso and his force's freedom. If the exchange is made, the Integrators will leave peacefully, which both allows T-Force and Kelso's forces to focus solely on the Marauders. It also restores relations with the Integrators, allowing T-Force to purchase high end upgrades and equipment for their forces that may not have been available earlier.
An Integrator Task Force will appear at a destroyed Founders Camp and setup a trading post outside of Oklahoma City after the Founders and T-Force claim it. Like at other outposts of the main Integrator Camp, T-Force can trade for goods in exchange for Goodwill credits.
Sometime after T-Force's mission to Fort Worth and the acquisition of critical intel regarding Legion's infiltrator program, Movement forces would once again make contact with T-Force's commanders through Lucia Flores. Through her, T-Force learns that the Movement, though viewing the Integrators as a valuable trading partner, has become distrustful and disgusted at the organization's slaving practices and are planning to cripple them. Coincidentally, the Founders are looking a method to get their forces close enough to a Legion base in Galveston and Lucia reveals the existence of the Integrator's Electronic Warfare System and proposes stealing it from them. Founders Actual signs off on the operation and T-Force heads to the main Integrator Camp.
Before a theft operation occurs, Lt. Church enquires with the Integrators if there's anyway to acquire the EWS system through trade or purchase. The Integrator Elder provides T-Force with a mission: head into Midland to explore the source of the interference and the curse. From there, T-Force conducts a mission that succeeds in the retrieval of a Digital Storm system which renders the need for the EWS redundant and given over to T-Force.
However, T-force joins up with Lucia and together, they launch a mission to also steal the Digital Storm that had been retrieved from Midlands from the Integrator Camp. Lucia, Church, Sgt Mason, and their respective teams manage to infiltrate the camp itself, steal the HEMTT vehicle housing the Digital Storm, hide it from the Integrators, sabotage Integrator defenses, and flee the scene. Then, a major assault by Regular T-Force units engages and destroys much of the Integrator camp, killing the Integrator Elder there, and successfully extracts with the Digital Storm Vehicle before withdrawing successfully. This attack wrecks much of the Integrator Camp and weakens the organization in the region, ensuring they wouldn't become a major threat in the future.
We Are Legion
Before the attack on the Galveston facility, surviving or unharmed Integrators begin rallying at what was once their main camp. However, just when the Integrators were at their lowest point, a massive Legion assault force arrives and attacks all Integrator forces. Legion, searching traces of the Digital Storm and taking advantage of the loss of the EWS, attacks and eliminates the remaining Integrators in the area. Then, receiving word of the Founder's attack on Galveston, Legion's attention is diverted elsewhere. This allows surviving Integrators, especially those that had research the Midlands Prototype, to escape to other settlements.
In addition, the Integrators also discovered of T-Force and Lucia's actions that resulted in the loss of both the EWS system and the Digital Storm. Aware that Alex Church was responsible for the death of many of their brothers, the Integrators planned to mount a strike on the Resistance's base at Austin.
Unfortunately for the Integrators, Legion decides that their group needed to be kicked down once more in its quest to find more information on the Digital Storm. A group Integrators under Tech Elder Walker, having established a new camp in the vicinity of Albuquerque, managed to erect an EMP emitter defense. This proved fruitless, as a Legion force disabled the emitter and then proceed to tear down the Integrator's hard work in establishing a new camp. Though the Integrators put up a stalwart defense, much of the defenders were wiped out and the settlement seized. This caused Tech Elder Walker to flee from the scene and the remaining Midlands technicians to surrender to Legion. Among these captives was one Acolyte Silas, who would become vital in the future.
These surviving Technicians, particularly Silas, would become vital in Legion's hunt for the Digital Storm and its creator. Its unclear how many of these technicians Legion (or more specifically Hunter Unit 1462) had taken captive but at least four (including Silas) were taken into custody when considering the presence of Silas's Pioneer Squad. Silas would become instrument in both researching the Digital Storm and instigating a divide between Legion and Unit 1462, culminating in 1462's rebellion at the Lincoln memorial (which Silas would flee from the scene of).
6 months after Unit 1462's rebellion and the subsequent nuclear strike, the Integrators are shown to remain as an organization, with Silas having become an Elder himself. The group is able to recover the HEMTT truck that 1462 used as a vessel during its rebellion, and Silas proclaims that 1462's days with Legion were over and that he had some big plans.
Uprising
Despite the previous maulings, the Integrators managed to re-establish control in the Northeastern portions of the Heartlands of sectors 3 and 4 (which consists of parts of Tennessee and Arkansas) and managed to evade Legion detect via the use of heavy electronic jamming. That being said, the use of jamming consumes significant amounts of supplies the Integrators lacked. Desperate for resources, they make contact with surviving Founder Forces under Major Steven's command and requests supplies in exchange for a friendship between the Integrators and Founders (along with supplying the Founders with vehicles).
How this relationship between the Integrators and Founders/Resistance depends on the player and resource stockpile players have. One can simply deny this alliance, however the Integrators are a major ideal supplier of not only vehicles, but also dedicate tank crews (through their pioneer teams) and weapons technology (including providing a railgun if the relationship grows to open friendliness). If the player continues to purse friendly relations with the Integrators, not only will the Integrators openly ally with the resistance/Founders, but may be called upon to fight either Legion or the Cartel to repay old debts. And eventually, its possible to bring the Integrators into the resistance proper.
Equipment and Troops
Though the Integrators have access to some phenomenal technology, much of their equipment shares similarities with those of the Movement (created and modified from existing assets). This is especially apparent with their vehicles, with the Integrators making use of either technicals of various types or heavy vehicles that mash the designs from other factions (contrasting greatly with both the Founders and Cartel, who mostly make use of purpose built military hardware). Still, the Integrators make good use of their advanced technology and are one of the few factions who can field plasma and more exotic weapons en masse (this includes advanced prototypes like the Railgun, but also more conventional ordnance like the SRAW missile launcher that the Founders themselves don't field much). That being said, Integrator infantry squads show similarities to that of the Founders.
It should also be noted that Integrator technology (especially their vehicles) are rigged and bugged so that when outsiders use it, they can be tracked down and recovered. This means that any stolen Integrator vehicles can be used by other owners, but they will be tracked down and hunted by the organization for doing so. That being said, this rigged nature can be bypassed and disabled provided on has the experience and knowledge to do so, like Big Bob.
Infantry
The baseline Integrator infantry squad are called Harvesters, which are organized somewhat like the standard Founders Infantry squads. Most are armed with plasma rifles with an LMG (usually Plasma based) and a SMAW launcher as support. Like the Founder's equivalent, this means that a basic Harvester can generally be expected to take on most foes baring heavy vehicles with decent effectiveness. Harvesters are dressed in military style BDUs with combat riggings and greenish camofaluage, with helmets that fully obscure their faces and armour pads. across their body.
The standard driver crews and scouts of the Integrators are called Pioneers, and organized akin closer to Founder Engineering teams. In addition to being able to preform the standard roles as Founder combat Engineers (barring an inability to lay mines), Pioneers are also able to crew all ground based vehicles ranging from Tanks to Technicals. Like their Harvester counterparts, Pioneers wear uniforms and combat riggings akin to pre-judgement day militaries albeit with some wearing either grey helmets or hoods with all wearing red googles.
Eraser teams serve as not only not only the Integrators dedicated anti-infantry team, but are also key in a multitude of combat tasks ranging from searching for runaway slaves, destroying unwanted hang leaders, or eliminating leaders of survivor settlements. Eraser teams are composed of a trio of operators, a pair of snipers and a regular infantry operator. The snipers are outfitted with both a large caliber sniper rifle (usually of 50 BMG caliber) and laser sniper rifle, with the infantryman is armed with a light machine gun of the Plasma variety. And all are outfitted with secondary plasma rifles.
Smashers are a two man heavy weapons teams outfitted with crew served weapons, usually a heavy plasma machine gun and secondary plasma rifles. They serve as sentries for Integrator bases or as support for units when heavier firepower is required.
Vehicles
The most common and standard vehicle in use by the Integrators are their version of the Movement pickup truck, albeit with upgrades seen only with the illusive organization. Most notably, this light gun truck has had its engine replaced with an electric variant and its weapon turret is remote operated like the weapon system seen on the Stryker (with similar limitations in that heavier weapons like ATGM launchers and Recoilless rifles being incompatible with the mount in exchange for the safety of the gunner). And like the Movement's version, the Integrator Technical can tow light trailers like gun platforms.
The Heavy Technical is unique on the wastelands of the United States as it blends the components and technologies from several different factions. The base uses the chassis of the Bradley IFV (albeit with an electric drive instead), a movement style pickup truck mounted on top of the cab, and the upper part of a captured Legion Spider mounted on the rear sporting weapon systems (controlled directly from an operator in the cabin). The basic variant, armed with a pair of 25mm autocannons, is the most prevalent in Integrator service but versions equipped with forward firing MRLS pods, ATGM launchers, and Surface to Air Missiles can be found. The Heavy Technical can also tow any light or heavy towed platforms that don't require a fifth wheel mount.
Integrator Tractors are built similarly to Heavy Technicals albeit with the weapons platform removed. They can be used to tow platforms that require that fifth wheel mount including Heavy Weapons platforms and Armored Carrier Trailers. Be warned though, these Tractors are completely devoid of weapons and are defenseless.
The Integrators also operate a variant of the heavy technical that mounts the heavy plasma howitzer seen on Legion Artillery Walkers. Firing a plasma shell at opponents, Integrator artillery will make a mess of any vehicles and infantry they hit, at the cost of less splash damage and no fragmentation.
For various reasons, the Integrators have followed the Movement in designing combat platforms that required to be towed into battle. This includes an Integrator designed Heavy Weapons platform that can mount most heavy weapons (from twin light plasma autocannons to heavy Plasma cannons) on a modified semi-trailers. While an effective combat platform, it does have some flaws when compared to the Movement's Heavy Weapons Platform, namely the inability to mount a secondary weapon system (like an HMG) and needing to be towed by a vehicle that has a fifth wheel mount.
The Integrators also make use of a Towed armored carrier like that of the Movement, with their armored carrier being a semi-trailer that can carry 18 combat personnel and armed with a IFV style weapon and an HMG equivalent in a pair of turrets. Unlike the Movement trailer, the Integrator version already has the turrets pre-installed and don't require further modifications, although this comes at the cost of space for 6 extra personnel. And like the Movement variant, infantry can fire out these trailers.
When push comes to shove, the Integrators will bring out their tanks (one of the few factions of the wasteland that operates heavy tanks akin to the Founder's Abrams and Legion Tanks). Integrator tanks, like other vehicles, use components from other factions. In this case, it's taking the chassis of a Legion Tank and replacing the original turret with a modified Movement heavy platform. The Integrator tank is flawed when compared to the Legion version, sporting only one plasma cannon instead of the robot's pair and heavy the armor levels of an up-armored Movement heavy platform. Still, the Integrator tank does make up somewhat by being able to mount a secondary weapon (an HMG equivalent) and remains a potent force when properly used.
The Integrators also use heavy Dozers for construction for combat, construction, and towing duties (primarily by towing Integrator trailer houses). Like the Integrator Tank, the dozer is built on Legion tank chassis and shares similarities with the Movement version, although do take note that these dozers are difficult to maintain.
Lastly, we should mention of the Integrator's newest prototype tank. Armed with a brand new, super powerful Gaussian cannon (commonly known as a railgun), the Integrators have somehow created an extremely powerful weapon system that can destroy any known armored vehicle with a single shot (be warned its useless against infantry). For unknown reasons, the Integrators have chosen to use an old Sherman tank from the Second World War as its base, meaning that the Sherman Railgun tank has colossal anti-vehicle power at the cost of weak armor and an inability to engage infantry. Currently, this vehicle was last seen in service with T-Force (likely either kept from during the Vega mission or stolen from the main camp).
It should also be noted that the Integrators aren't above using hardware captured from other factions. Most notably, this is demonstrated in both the missions in Nueva Tortuga and Forts Worth. In the former, the Integrators are noted to be selling intact Legion models to the Cartel in exchange for Pesos or slaves while also making use in Legion artillery walkers. In Forts Worth, the Ratz gang reveal that Integrators frequent Legion scrapyards to capture and take away intact Legion models via the use of controllers. They are also in the possesion of ex-US military hardware that they usually sell on the market or break down to be turned into new vehicles. Atleast one intact M113 and a Bradley can be found in the scrapyard near the main Integrator Camp.
As shown in Uprising, most Integrator vehicles can be upgraded past their initial capabilities. This ranges from engine upgrades, more room for ammo or spare parts, better speed, more efficient fuel consumption, and the like. However, these upgrades notably do not include armour upgrades and Integrator vehicles will usually find no such upgrade add ons (like universal junk armour) avalible for them.
Relations
Legion - Hostile. While seeking to emulate the machine, the Integrators will try to avoid the eyes of Legion itself as their camps usually lack the fortifications and defences to hold of a full fledge Legion assualt. Legion is also disgusted/annoyed at the Integrators attempts to become machines, as demonstrated in Uprising.
Founders - Generally non-existant/unknown prior T-Force's operations. The Founders don't indicate that they have any formal relations or ties with the Integrators (likely due to the fact that the Founders operate primarily in the Eastern United States). That being said, the Founders are more than willing to conduct operations (like stealing the EWS) against the Integrators, showing that they don't view the organization in a great light.
Movement - Mostly transactional but distrusted. While the Movement does appreciate stable access to advanced weapons tech, they also aren't exactly appreciative of Integrator's slave system. Though the Movement never formally moves against the group, Movement agents are allowed to sabotage the Integrators.
Cartel - Transactional and Trade. The Integrators and the Cartel have a fruitful trading arrangement between them prior to the Fall of Haven, with the Cartel purchasing Legion hardware wit Pesos while the Integrators purchase or trade for slaves or currency. That being said, the two organisations aren't true friends and this relationship can turn hostile, given a bit of sabotaging. In Uprising, the Integrators can assist the Resistance/Founders in fighting the Cartel.
Resistance/T-Force - Hostile in We are Legion Campaign. Already angered at T-Force's actions, the Integrators were already planning a strike on the Movement base at Austin, Texas. Though captured by Legion, these Integrators provide data that compromises Resistance capabilities. However, this can change in Uprising, with relations capable of being restored despite the actions of T-Force. Provide the Integrators with supplies and the resistance/Founders can recieve vehicles, upgrades, and crews.
Other Survivors - The Integrators don't seem to mind trading with independent or smaller groups, as noted prominently in the Forts Worth mission where they work with the Ratz Gang to procure intact Legion vehicles (providing vehicle controllers to the Ratz Gang as well). A collection of marauder squads can be found hanging out in the trade/entrance area of the main camp as well.