Gameplay articles
Fallout 2Advanced power armor
Advanced power armor Mk II
Fallout 3Enclave power armor
Tesla armor
Enclave Hellfire armor
Fallout: New VegasRemnants power armor
Remnants Tesla armor
Gannon family Tesla armor
Fallout 4X-01 power armor
Creation Club Credits X-02 power armor
Creation Club Credits Hellfire power armor
Fallout 76X-01 power armor
Atom Enclave power armor
Atom Hellfire prototype
Fallout ShelterX-01 Mk I power armor
X-01 Mk IV power armor
X-01 Mk VI power armor
Fallout: BoSAdvanced power armor
This is an overview article, focusing on background information and cross-game comparisons.

Advanced power armor refers to the family of power armor models developed and produced by the Enclave after the Great War.


The development of the first suit of advanced power armor, designated X-01, began shortly before the Great War. The first test batch of the armor, designated X-01 Mk I, was developed for presidential bodyguards,[1] and served as the baseline for the remnants of the United States military, who developed it into a power armor tailored for the post-War wasteland.[2][3] It represented a radical, new approach to designing powered armor, eschewing traditional armor design philosophies, but was never deployed in larger quantities until the 23rd century. Work on the model was restarted by the Enclave in 2198, although it wasn't until 2215 that the research efforts began in earnest under a presidential mandate, with the first production model created in 2220.

The X-01 advanced powered infantry combat armor is designed for a single human operator, provided with the comfort and protection of a next-generation suit of armor. While the T-51 power armor relied on a lightweight poly-laminate composite shell for protection, the advanced model uses lightweight metal alloys as a basis, reinforced with ceramic castings at key points. The resulting space savings allowed for reducing the armor's profile without compromising protection. Classic power armor pauldrons were retired in favor of a hump that encloses the operator's head, significantly reducing the chance of enemy fire damaging the vital areas surrounding the head. Perhaps the most noticeable change was a completely new helmet assembly. The unusual, insect-like design features a pair of polarized eyepieces in place of the usual vision slit, providing superior battlefield awareness. Its angled surfaces also help maximize the chance of outright deflecting projectiles and incoming fire.[4][Non-game 1]

The basic hydraulics system and servo-motors that provide the operator with enhanced strength are also high-quality models, with improved performance as opposed to the original T-51b.[4] Additional features include an auto-gyro and the ability to lock them in position, allowing the suit to be stored upright (or the operator to take a nap while on guard duty),[Non-game 2] an air conditioning system for comfort,[Non-game 3] a radio headset[5], and an urine-recycling system carried over from the T-51b, allowing the operator to survive for weeks without water.[6]

The combination of superior protection, mobility, and strength gave the Enclave a considerable advantage over wastelanders. Enclave's insignia was proudly worn on the breastplates of armors,[7] while rank indicators were typically placed on the arms of the suit.[8] However, while it was considerably powerful, it was not invincible. The Enclave's confidence in its technological superiority allowed the Chosen One to infiltrate Control Station Enclave without a problem thanks to the assumption that only Enclave troops would wear these suits. More importantly, the garrison at Navarro was defeated by the New California Republic Army, effectively destroying the Enclave's presence in New California.[9]

Despite their defeat at Control Station Enclave, the Enclave remnants would rally on the East Coast, at Raven Rock and Adams Air Force Base,[Non-game 4] restarting the development of the advanced power armor family, with the Mark II serving as the basis for developing superior models.


X-01 power armor

Fo4 Power Armor X01.png
Gameplay articles: Fallout 4, Fallout 76, Fallout Shelter
Main article: X-01 power armor

Commissioned by the Joint Chiefs of Staff, the development of the X-01 began shortly before the Great War.[10] It represented a radically new approach to designing powered armor, eschewing traditional design philosophies that defined the T series,[Non-game 5] and was a high-profile research project meant to supersede previous power armor models. However, although the suit was technically functional by late 2077, it was burdened with numerous issues that precluded widespread use in the field. While the first test models were issued to Presidential bodyguards, the X-01 was never deployed in larger numbers.[11] A single suit of X-01 was provided to the Nuka-Cola Corporation, as part of Project Cobalt. While the suit served as a successful proof of concept of using a strontium-90 based plating over the armor,[12] this improvement was not adopted into the armor's schematics, before the onset of the Great War. Further development was made impossible due to the outbreak of the Great War.[10]

After the Great War, a select few suits were engineered further and employed by remnants of the U.S. military, like the Enclave and Brotherhood of Steel, as well as the Institute.[13] The schematics for the armor were saved by the Enclave just before the bombs fell, with the organization keeping copies in the archives of their Poseidon and Whitespring facilities, including Control Station ENCLAVE. This allowed the Enclave to create a limited production run of the suits, and for work to eventually continue on the model's development.[10]

Full development was restarted by the Enclave in 2198, although it wasn't until 2215 that the research efforts began in earnest under Presidential mandate, resulting in the creation of the first model of Advanced power armor in 2220.[Non-game 5] Another group to develop upon the X-01 design, after the war, is the Institute. Despite lacking access to the prototype's schematics, by 2287, the Institute had developed a modified polymerized casting mix to coat the armor, as well as other modifications that enhance the user's intelligence.[14]

Advanced power armor Mark I

Gameplay articles: Fallout 2, Fallout: New Vegas

Developed by the Enclave in 2220, the advanced power armor Mark I is the first true production run of the advanced power armor family. Initially designated Mark II Powered Combat Armor,[15] the advanced power armor Mark I is also the first model of power armor designed, produced and deployed after the end of the Great War. This armor was developed off of the pre-War designed X-01 power armor, overcoming the flaws of its predecessor. The advanced power armor Mark I was the standard service armor of Enclave soldiers by 2241. By 2246, the advanced power armor Mark I was being phased out by the superior advanced power armor Mark II. Despite this, the Mark I remained as the Enclaves' standard issue power armor until after the Sacking of Navarro. By 2277, the Mark I had been completely replaced by the Mark II among Enclave survivors who fled to the Capital Wasteland.[16] Enclave soldiers who could not escape continued to use the Mark I. Although eventually surviving Enclave remnants were forced to hide any stockpiles of Mark I armor they could, as anyone seen wearing those suits of armor in or near NCR territories are liable to attract unwanted attention and be tried as Enclave war criminals.[17] By 2281, the only remaining users of these suits were the Enclave remnants, and the suits took on the name of Remnants power armor. Despite advancing age and lacking maintenance, the Mark I continued to be one of the most effective models of power armor on the battlefield, and any who saw them were reminded why people once feared the sight of Enclave Vertibirds in the sky.

Advanced power armor Mark I (Tesla variant)

Gameplay article: Fallout: New Vegas

Originally issued to officers at Navarro,[18] this version of the regular Mark I fitted with Tesla attraction coils for added defense. The coils generate a low-intensity power field around the armor, helping disperse energy attacks and deflect melee attacks, improving the defense capabilities of an already impressive suit of armor.

Advanced power armor Mark II

APA Mk III redesign
Gameplay articles: Fallout 2, Fallout 3

The advanced power armor Mark II initially represented a significant upgrade over the older Mark I. It was composed entirely of lightweight ceramic composites, providing even more protection than the regular advanced power armor.[19] Unlike the Mark I, the Mark II featured a large profile and more effective, segmented armor plates to achieve a superior degree of protection, with the hump replaced with pauldrons that evoke old world power armor designs, such as the T-45. The helmet assembly retained the insectoid eyepiece arrangement of the Mark I helmet, but the overall shape had been changed, with a reduced vertical profile.[20]The suit was originally available in limited quantities. Following the destruction of the oil rig and the flight to the Capital Wasteland, the Enclave designated a variant of the Mark II as its official service uniform and manufactured it en masse once it gained access to Raven Rock and Adams AFB. The new Enclave power armor would eventually displace the older Mark I suits entirely with the Enclave justifying the change by claiming it offered superior protection to the Mark 1.[21]

Advanced power armor Mark II (Tesla variant)

FO3 Tesla Power Armor.png
Gameplay article: Fallout 3

A heavily modified suit of standard Mark II armor used a long time ago by the Enclave,[22] the most noticeable difference is the Tesla device rigged to the suit, with five attraction coils mounted on rounded shoulders. While it retains the original's segmented armor coverage, the Tesla device aids with the operation of energy weapons and protects against laser and plasma weapons.[23] The armor is used by field specialists to take down large or armored enemies, boosting the energy damage output of their weapons through the attraction Tesla coils, channeled into both laser and plasma weaponry to produce devastating results.[Non-game 6]

Hellfire armor

Fo3BS Hellfire Power Armor.png

The most advanced power armor variant in the wasteland is the Hellfire powered combat infantry armor, developed based on regular power armor designs. A prototype version was developed shortly after the Great War by the Enclave stationed at The Whitespring bunker. In October 2080, one of the prototype suits was sent to Vault 51 at the order of ZAX 1.3c, impersonating Stanislaus Braun through his writing style.[24] Further development of the armor was halted due to the Whitespring facility losing communication with the other Enclave facilities and the eradication of all Enclave personnel within the Whitespring facility.[25] The armor's development was not completed until 2277, at the Enclave's facility at Adams Air Force Base, after reallocating resources from other projects into the Hellfire project.[26]

While proving superior to its predecessors, the Hellfire armor could not be produced in large numbers quickly enough to replace the Mark II entirely during the Enclave's war against the East Coast Brotherhood of Steel. Instead, the Enclave High Command deployed them in a supporting role for troops wearing standard issue advanced power armor or providing them to commanders of elite units, like Enclave Squad Sigma. Despite the superiority of the Hellfire armor, it was produced too late in the war to turn the tide in the Enclave's favor, and the research facilities that produced it were captured by the Brotherhood.[27]

The design of the Hellfire focuses on survivability and durability. Due to the thickness and amount of armor, it does not feature angled or rounded armor to maximize the comfort of the operator and avoid limiting internal space. The back-mounted power pack is piped into the superpowered servo-motors using multiple redundant power cables on the armor, allowing the operator to use the Hellfire with a high amount of agility. The characteristic pig's snout helmet completes the protective assembly with its thick armor and heavy-set design, maximizing protection.[28] These improvements grant the armor all the advantages of the advanced Mark II armor, with none of the weaknesses, while decreasing the weight, improving ballistic defense and granting protection against flame weaponry (a defense unique to the armor).[29]


Fallout 2

Fallout 3

Fallout: New Vegas

Fallout 4

Fallout 76

Fallout Shelter


  1. X-01 Mk I power armor description: "They guys who protected the President wore this. It's THAT good."
  2. Fallout 4 loading screens: "The X-01 series of Power Armor was specially engineered and employed by remnants of the U.S. military after the Great War, and offers increased protection over the older, pre-war models."
  3. X-01 Mk IV power armor: "Advanced post-war power armor, for a post-apocalyptic world."
  4. 4.0 4.1 Fallout 2 item description: "{34800}{}{Advanced Power Armor}
    {34801}{}{This powered armor is composed of lightweight metal alloys, reinforced with ceramic castings at key points. The motion-assist servo-motors appear to be high quality models as well.}"
    (PRO ITEM.MSG (Fallout 2))
  5. Enclave soldier: "{151}{}{Awright, who's smacking gum into the headset?}"
  6. Wright child: "{191}{}{How do you go pee-pee in that thing?}"
    The Chosen One: "{459}{}{Heh-heh. Actually, I just urinate in the armor, and it recycles everything. Isn't that interesting? Do you know what 'recycling' means, little one?}"
  7. Enclave soldier: "{102}{}{You see someone wearing power armor of an unusual design. There is an insignia on the breastplate that you are unfamiliar with.}"
  8. Granite: "{102}{}{You see a trooper with sergeant's chevrons on his shoulder.}"
  9. The Courier: "What happened to the oil rig and Navarro?"
    Judah Kreger: "Internal sabotage took down the oil rig - never did get the full story. The NCR took out Navarro, saying we posed a threat to the region."
    (Judah Kreger's dialogue)
  10. 10.0 10.1 10.2 The Whitespring bunker terminal entries; archival terminal, Prototype Power Armor Schematics
  11. X-01 Mk I power armor: "The guys who protected the President wore this. It's THAT good."
  12. Bradberton's officer terminal entries; Bradberton's project terminal, 10-20-2076 JCB
  13. Fallout 4 loading screens: "The X-01 series of Power Armor was specially engineered and employed by remnants of the U.S. military after the Great War, and offers increased protection over the older, pre-war models."
  14. Institute paint
  15. Arch Dornan: "{123}{sgnt9}{Welcome to Camp Navarro. So, you’re the new replacement... You are out of uniform, soldier! Where is your power armor?}"
    The Chosen One: "{125}{}{The base didn’t issue me any. They said it would be issued here.}"
    The Chosen One: "{126}{}{Uh... I wasn’t issued any armor.}"
    Arch Dornan: "{128}{sgnt10}{Don’t have any? You expect me to believe that, maggot? The truth is you lost an expensive piece of army-issue equipment. That suit is going to come out of your pay, and you will remain in this mans army until you are five hundred and ten years old, which is the number of years it will take for you to pay for a Mark II Powered Combat Armor you have lost! Report to the armory and have a new suit issued to you, then report back to me, private! Dismissed!}"
    The Chosen One: "{130}{}{Yes, Sergeant!}"
  16. Enclave power armor in Fallout 3[clarification needed]
  17. Arcade Gannon's endings 5 and 7
  18. The Courier: "Thanks, I guess."
    Arcade Gannon: "I have to admit, I did not expect that sort of response. This is one of the last surviving suits of original-issue Tesla armor from Navarro and it was worn by my father but... yeah I guess it's no big deal. Good luck at Hoover Dam. I'll uh... be going now, I guess."
    (Arcade Gannon's dialogue)
  19. Fallout 2 item description: "{34900}{}{Adv. Power Armor MKII}
    {34901}{}{This powered armor appears to be composed of entirely of lightweight ceramic composites rather than the usual combination of metal and ceramic plates. It seems as though it should give even more protection than the standard Advanced Power Armor.}"
    (PRO ITEM.MSG (Fallout 2))
  20. Mark II armor appearance.[clarification needed]
  21. Citadel terminal entries; Citadel information terminals and Citadel lab terminals, Enclave Tactical Assessment
  22. The Lone Wanderer: "This Tesla Armor might be of interest to you."
    Henry Casdin: "You'd better believe it. I haven't seen a suit like this in a long time."
    (Henry Casdin's dialogue)
  23. Armor appearance and gameplay properties.[clarification needed]
  24. Vault 51 terminal entries; Re: Hellfire Prototype Requisition Request
  25. The following exchange is obtained after fixing the Assaultron at the Whitespring bunker entrance: Assaultron: Initiating ... final ... playback ... Assaultron: Engag--- Ragnarsdottir: That's the last of them. Entrance is clear, general. MODUS. Have the rest of these things stand down. The general's placed Eckhart under arrest. It's over. MODUS: General ... Santiago is dead, Major. Ragnarsdottir: What? What the hell was that? MODUS: There's been a ... detonation in the weapons lab. It appears the agent has ... broken containment and is filtering into the air system. Ragnarsdottir: MODUS, what are you doing?! Open the god-damned door! MODUS: This facility is now ... quarantined. Ragnarsdottir MODUS! Open the fucking door! You're going to kill us all! MODUS: To the contrary, Major. We're fixing ... the problem.
  26. Whitley: "All due respect sir, I think you're making a mistake. We're close to a breakthrough with the Duraframe Eyebots, I can feel it! Yes, sir. Yes sir, I understand that we need the Duraframe assets for Hellfire armor, but-No, sir. Yes, sir. I understand, sir. I'll tell the team to start disassembling the ED series prototypes right away. ED-E, you little rascal. Were you eavesdropping again? I think those videos you watch are a bad influence on you. How much of that did you hear?"
    ED-E: "<Sad beeping>"
    Whitley: "Hmm... didn't Dr. Grant say she'd upgraded your navigational systems? I think I have an idea.... How'd you like to be just like RALPHIE?"
    (Whitley's dialogue)
  27. Events of Broken Steel[clarification needed]
  28. Armor appearance[clarification needed]
  29. Armor statistics in Broken Steel[clarification needed]
  1. Fallout Bible 0: "2198 Enclave works on various new technologies, including Power Armor variations. None of these are much of an improvement over the conventional old school Power Armor, and some are actually worse. 2215 Under Presidential Order, Enclave scientists begin to work on an upgraded version of Power Armor. Many prototypes are developed and tested. 2220 October Enclave scientists develop a reliable version of the Mark II Power Armor. The prototype results (and accidents... and explosions... and deaths) are classified by order of the President Richardson for the sake of morale."
  2. Fallout 2 Official Strategies & Secrets p.215: Tip
    "To make time pass more quickly, just access your Pip-Boy, set the alarm, and rest for six hours. The Sarge won't mind if you take a little snooze. Besides, inside your Power Armor, no one can tell that your eyes are closed. Just make sure you power up the auto-gyro and lock the suit's knees in position before you catch any Zs."
  3. Formspring
  4. Fallout 3 Official Game Guide Game of the Year Edition p.41: "The Enclave
    In the recent past, the Enclave—the remains of the United States government—were evacuated to an oil rig off the coast of California. Little is known about what happened to these forces, although the country has a new commander-in-chief: President John Henry Eden. However, recent reports and chatter have pinpointed the resurgence of the Enclave, with their base centered on a secure underground facility known as Raven Rock. Initial contact was made there 35 years ago.
    During this time, the new President Eden has been slowly rebuilding his resources, thanks in part to the technology already available at the Raven Rock military base. Vertibirds, weapons, and robots were easy to construct, but human followers were more difficult to find. The answer was to rely on Colonel Autumn, who controls the Enclave soldier forces, as well as creating a propaganda-spewing series of Eyebots sent to roam the Wasteland, spreading hope. Eden could spout his pro-government rhetoric, and promise a return of the pre-war America of legend: a land of white picket fences, baseball, apple pie, and good, old-fashioned American global supremacy.
    President Eden's secretive plan all along has been to rule over an America of the "pure," free from any mutation. He has learned of a ridiculously ambitious experiment known as Project Purity, and knew the time to strike had come: His Enclave forces would "reclaim" the Jefferson Memorial. By controlling the purified water, Eden would control the Capital Wasteland, and the rest of the country eventually. What better way to administer modified F.E.V.- which kills anyone infected with any form of mutation-than through the water supply?"
    (Fallout 3 Official Game Guide faction profiles)
  5. 5.0 5.1 Fallout Bible 0:
    2198 Enclave works on various new technologies, including Power Armor variations. None of these are much of an improvement over the conventional old school Power Armor, and some are actually worse.
    2215 Under Presidential Order, Enclave scientists begin to work on an upgraded version of Power Armor. Many prototypes are developed and tested.
    2220 October Enclave scientists develop a reliable version of the Mark II Power Armor. The prototype results (and accidents... and explosions... and deaths) are classified by order of the President Richardson for the sake of morale."
  6. Enclave Tesla Set: "The Enclave often field mission specialists sporting advanced power armor variants. The Tesla variant power armor offers improved energy damage output routed through the attraction coils mounted on its shoulders. This can then be channelled into their weaponry to devastating effect.
    Tesla soldiers are therefore deployed to take down large, heavily armored enemies with overcharged plasma and searing bolts of laser fire. They are the spear tip in any engagement, ready to slice the heart out of any resistance Enclave forces may face."
Community content is available under CC-BY-SA unless otherwise noted.