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[[quoteright:220:[[VideoGame/{{Half-Life2}} http://static.tvtropes.org/pmwiki/pub/images/hl2combine.jpg]]]]
[[caption-width-right:220:[[EvilIsPetty Pick up]] [[PoliceBrutality that can.]]]]
->''"What scared me the most was when my father would put on [[UsefulNotes/WorldWarI the gasmask]]. His face would disappear... This was not a human being at all."''
-->-- '''Creator/PhilipKDick'''

An extremely popular form of the FacelessGoons, achieved by taking your enemy Mooks and giving them all gas masks. Note that this almost always occurs in situations where the gas masks [[GogglesDoNothing serve no real practical purpose]], as chemical weapons aren't even a factor in whatever conflict is involved.

In situations (especially video games) where the majority of Mooks are ''not'' FacelessGoons, gas masks are often the mark of EliteMooks. Despite the prevalence of gas masks amongst the enemy forces, it never seems to occur to them to use chemical weapons against the heroes. This is even though 1) being evil, they presumably have no qualms against doing so ''and'' 2) the heroes typically are wearing nothing except civilian clothes and a smile. [[{{Stripperiffic}} If they're lucky]].

Funnily enough, in many video games, enemies wearing gas masks are still affected by gas-based weapons.

Let us be brutally honest, though -- it looks either [[RuleOfCool damned cool]] or [[RuleOfScary damned scary]]. There's a reason [[Franchise/StarWars Vader's]] face looks like a stylized gas mask. May also show up as the Mask part of CoatHatMask, and more commonly as part of a MalevolentMaskedMan ensemble. See also HazmatSuit.

The lack of an obvious need for gas masks may be justified as preventative measures. After all, nobody's going to use gas against an army issued gas masks, but they might well use it against one that isn't, leading to the illusion of gas masks being useless. British citizens were issued gas masks during UsefulNotes/WorldWarII for this reason, even though (or as a result) Germany never used gas in battle.

Subtrope of FacelessGoons and {{Mooks}}. May or may not be a marker of EliteMooks. Often crosses over with RadioVoice and DoomTroops.
----
!!Examples

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Anime/BubblegumCrisis'':
** A rare good guy example is the S.W.A.T.-like troopers of the Armored Division Police who wear gas masks when going into combat, even though they mostly fight cybernetic killer machines which never actually use gas as a weapon. It's possible that they only wear those masks in order to prevent the viewer from becoming too attached to the {{Red Shirt}}s.
** There is a certain scene in the first movie hinting why they wear them every time. A short view from the perspective of one trooper shows them having H.U.D.s in the goggles. So they might be a cheap way of ensuring gas protection, combat information, and radio communication.
** Also note that they are normally not meant to fight military-grade boomers; Dialy in the first episode even suggests letting the military handle the boomers. The ADP is normally meant to fight terrorists or criminals using high tech or civilian type boomers which went rogue. In the former case, gas attacks might happen and smoke grenades might be used by the police itself. Also, since they have riot shields in their arsenal, they might also be used as riot control, in which tear gas might be used by the police.
* [=Zaku IIs=] in ''Anime/MobileSuitGundam'' have cables running around their faces into a "snout", giving them a gas-mask-like look. Combined with their [[CyberCyclops Mono-eyes]] and the fact that they're ([[HumongousMecha Humongous]]) MechaMooks, it makes them nearly the ultimate in mook-dom. This reaches its peak with the [[http://www.gundam-unicorn.net/en/ms/03.html#02 Geara Zulu]] from ''Anime/MobileSuitGundamUnicorn'', which actually does look like it's wearing a gas mask.
* ''Manga/{{Naruto}}''
** Used weirdly during the chuunin exam: Team 7 + Kabuto run into some ninjas from another village, but there are only three of them; they're wearing ''cloth'' masks separate from their gas masks which only cover their mouths, and they can be easily told apart.
** They all make a reappearance in a {{filler}} episode where they use their masks for breathing underwater, and we actually see one without his mask. It later turns out that Hanzo, their village leader ([[spoiler:until Pain takes over]]), wears one as well. Even later, we find out [[spoiler:it's not just to let him breathe underwater; it also prevents others from being affected by [[PoisonousPerson his poison breath]] and he himself from being temporarily paralyzed by the poison released if the transplanted organ he implanted in his abdomen which make it is ruptured.]]
** When we first see these (book 2 or episode 6), they're worn by the Demon Brothers from a rogue faction of the Hidden Mist village. There, they're more clearly compact rebreathers and are used as such (the Brothers were hiding in a puddle).
** The {{samurai}} from the Land of Iron ''eventually'' turn out to be this, though it's a long time before we find out those helmets have gas masks in them (they're also RedShirt rather than {{Mooks}}, being good guys when we see them).
* In ''Manga/{{Trigun}}'', the bandit villain Brilliant Dynamites Neon has an army of bandits who serve him, all of whom wear gas masks. This is mostly due to the fact that he uses gas to knock out crews on the sand steamers that he robs. It turns against him when Meryl and Millie beat up two mooks and steal their outfits.
* Both played straight and inverted in ''Manga/DesertPunk'': the mooks wear gas masks when they're outside, but so does everyone else. They also serve an actual purpose, as, besides working as actual gas masks against frequent poison attacks, they have built in binoculars and personal air-conditioning units.
* The regular-level soldiers in ''Manga/{{Hellsing}}'' wear gas masks. The Nazi Vampires also wear them...as protection from the sunlight. At night, they don't wear them, though many of them pull scarves up over their face, presumably because it looks totally awesome.
* The ordinary soldiers of the Britannian army in ''Anime/CodeGeass'' wear gas masks as part of their uniform. They don't get attention in the series often, in battles that are mostly decided with [[HumongousMecha Knightmares]], but for some reason, their opaque masks never gain significance even though they could block the protagonist's [[MindManipulation mind control]] powers.
* In ''Anime/CowboyBebop'', the temperatures on Callisto are so frigid that many wear masks outdoors. A large gang of them mistake forever-broke Spike for a cash-laden Vicious and attempt to rob him. This does not end well for them.
* In ''Manga/NausicaaOfTheValleyOfTheWind'', the manga and the movie, almost everyone carries gas masks in order to deal with the highly toxic atmosphere of the Sea of Corruption. Wormhandlers and Torumekian grunts, however, rarely take them off.
* ''Anime/DigimonXrosWars'' has Troopmon. Supplementary material elaborates that they are actually comprised of energy stolen from other Digimon stuffed in the rubber suit-gas mask combo, and when destroyed, that energy is just recollected and reused, making them an interesting variation of this trope.
* Caesar Clown's mooks in ''OnePiece'' were introduced this way, wearing rather creepy gas masks. It's justified in this case, however, because Caesar's powers (and their armaments) are all based around gass based weapons.
%%* The [[TheEmpire Vandenreich]]'s [[PuttingOnTheReich Soldat]] in ''Manga/{{Bleach}}''.
[[/folder]]

[[folder:Arts]]
* Bunky Echohawk is fond of drawing these.
[[/folder]]

[[folder:Comic Books]]
* Nort soldiers in ''RogueTrooper'' almost always wear gas masks. {{Justified|Trope}} because the atmosphere of Nu-Earth is poisonous to normal humans.
* Used, [[LampshadeHanging lampshaded]], justified, subverted, and used as a ChekhovsGun in a ''BuckDanny'' comic, when he is escorted by russian guards in full chemical warfare gear. He manages to escape from them briefly to give a warning signal. The BigBad demands why his lieutenant dressed the Mooks like that, and the man cites that the KGB handbook says it has a good intimidation factor. The Big Bad is angry that the man thinks that someone like Buck would be frightened of some overalls. In the end, it turns out the lieutenant was on Buck's side from the start and meant for him to give the warning.
* The Front Line Group wore gas masks to hide their identities when they first showed up in ''ComicBook/NoHero''.
* In ''ComicBook/AllFallDown'', the Order of Despots' minions are all equipped with their stand issue, needlessly creepy gas masks.
* Black Spectre, a NebulousEvilOrganization that primarily antagonizes Comicbook/{{Daredevil}}, has its agents wear gas mask/helmets that include full face visors.
[[/folder]]

[[folder:Fan Fics]]
* The invading human forces in ''FanFic/TheConversionBureauColdWar'' are decked out in full NBC (Nuclear Biological Chemical) gear, which helps great against the potion throwing guards. Though the suits can still be torn by arrows.
[[/folder]]

[[folder:Film -- Animation]]
* In the Disney animated feature ''Disney/AtlantisTheLostEmpire'', the villain's loyal mooks wore gas masks throughout the entire film (even though it's set in 1914 -- ''before gas warfare was invented''). Likely reasons include ease of animation and dehumanization to make them acceptable casualties. (Plus, while gas warfare didn't exist, running into gas pockets was a likely hazard).
* The soldiers of the evil Wizard Blackwolf in Ralph Bakshi's animated film ''WesternAnimation/{{Wizards}}''. Yes, you saw it right, they work for a wizard and they wear World War I gas masks. Two of these mooks get the [[http://www.youtube.com/watch?v=0W7IOzb-LaQ best scene in the whole movie]]:
-->'''Max:''' Fritz, get up for God's sake! Get up! They've killed Fritz! They've killed Fritz! ''(draws gun)'' Those lousy, stinking yellow fairies! Those horrible atrocity-filled vermin! Those despicable animal warmongers! They've killed Fritz! ''(starts shooting off-screen)'' Take that! Take that! ''(Fritz gets up)'' Take that, you green slime! You black-hearted, sharp, bow-legged--\\
'''Fritz:''' Max, Max, I'm okay. I'm okay, Max. Just a scratch; look, I'm all right.\\
'''Max:''' Oh. Oh, damn. There you go again, stepping on my lines, raining on my parade, costing me medals. Oh, damn. ''(gun misfires, killing Fritz)'' Ooh. Oh, Fritz?
* The eponymous soldiers of ''TheKerberosSaga'' (which spans multiple media but is included here due to the AdaptationDisplacement of ''Anime/JinRohTheWolfBrigade'') are an aversion of the "mook" half of this trope, as an attentive viewer will notice that A) every single brigade member has a distinct personality and backstory, B) [[HumansAreBastards the inhumanity given to them by their status as "dogs" is often implied to make them morally superior to humans]], and C) [[MaskPower no troopers ever die in the series while their mask is still on.]].
* ''Anime/{{Interstella 5555}}: The 5tory of the 5ecret 5tar 5ystem'': The mooks sent by the Earl de Darkwood to kidnap the band are wearing gas masks. {{Justified|Trope}}, however, as they do use sleeping gas weapons to put down the opposition and capture their quarry alive and unharmed. It also hides for some time the ironic fact that they are humans kidnapping aliens.
* In ''[[{{Hoodwinked}} Hoodwinked Too: Hood Vs. Evil]]'', the resident Gas Mask Mooks are none other than Three Little Pigs reimagined as bazooka-toting mercenaries.
[[/folder]]

[[folder:Film -- Live-Action]]
* The first ''Film/ResidentEvil'' movie begins with a squadron of faceless goons abseiling in the windows via different camera angles.
* In ''Film/IronSky'' the Nazis are seen wearing gas masks as they load up into their flying saucers.
* ''Film/TheCrazies'': In both the original and the remake, all of the soldiers wear gas masks, although the Trixy virus is spread via drinking infected water. The soldiers wear them in case the virus has gone airborne and to hide their identities from the public.
* ''Film/{{Ultraviolet}}'' (2006) features an assortment of FacelessGoons, many of whom wear gas masks as their identity-concealer of choice. These include BigBad Daxus' personal platoon (who are specifically referred to as "the Gas Guard" in a semi-important manner, even though they turn out to be just regular Mooks wearing gas masks instead of motorcycle helmets), as well as a dozen white-clad EliteMooks who try to fight Violet using katanas instead of firearms (and end up doing a rather lousy job of it). Although the gas masks are somewhat {{handwave}}d in that the film takes place amid massive paranoia about a highly infectious blood-based disease, it's not clear why these particular goons feel obliged to protect their purity of essence with gas masks, instead of being content with the cloth surgical masks or motorcycle helmets most of the other Mooks use.
* The Russian stormtroopers in the ''Film/{{Hitman}}'' movie wear gas masks and football-gear-based armor straight out of ''Jin-roh: The Wolf Brigade''. Just in case they ever need to storm another opera house.
* ''Film/RepoTheGeneticOpera'' has Rotti's henchgirls donning gas masks in ''Things You See in a Graveyard''. Justified as they're throwing tear gas grenades.
* The opening scene in Creator/IanMcKellen's ''Theatre/RichardIII'' has Richard's commandos wearing gas masks. Of course, this is to allow a Dramatic Reveal of the villain during the opening titles. (Bonus feature: compare that opening to the first shots of the original ''StarWars''.)
* The tractor drivers in ''Literature/TheGrapesOfWrath''. Incidentally, the driver who talks to Muley just wears goggles.
* The Stormtroopers from ''StarWars''. Probably ''the'' example people think of about this trope, or at least high on the list of candidates.
* ''Film/FlashGordon'' (1980). The soldiers in Ming's palace.
* Justified in ''Film/{{Avatar}}'', as the toxic atmosphere requires some form of rebreather. However, the masks worn in the film are flat and not concealing at all.
* The Gravers in ''Film/{{Phantasm}}'' films wear gas masks. Reggie fights one in a chainsaw battle in [[PhantasmII the second movie]].
* The zombie German soldiers in the UsefulNotes/WorldWarOne sequence in ''Film/SuckerPunch''.
* [[StupidJetpackHitler HYDRA's forces]] in ''Film/CaptainAmericaTheFirstAvenger''.
* The opening attack on the Afghan village in ''TheBeastOfWar'' has the Soviet protagonists all wearing gas masks, partly because of all the dust kicked up by their tanks, but also because they're using DeadlyGas.
* ''The League of Gentlemen'' (1960). The ex-soldiers-turned-bank robbers wear gas masks during TheCaper, because they're using tear gas to cover their withdrawal from the bank, as well as to scare bystanders into compliance and hide their identities.
** Likewise in the robbery that opens ''Welcome to the Punch'' (2013), combined with BadassInANiceSuit.
* In ''Film/TheRunningMan'', all the guards in the detention zone at the start wear gas masks and protective goggles. They do have a good reason however, considering all the unhealthy stuff in the air from the old industrial complex. The prisoners are less fortunate.
[[/folder]]

[[folder:Literature]]
* ''Literature/WorldWarZ'': In the Battle at Yonkers, the Army brass decide to invoke this trope in order to create the appearance for the news cameras that the US Army troopers are invincible killing machines that are ready to mow down the shambling zombie hordes. On top of the MOPP-4 masks was layered body armor and the latest in [[HelmetMountedSight satellite commo gear]]. It fails miserably -- as told by a line infantryman, all this succeeded in doing is making every grunt on the line more tired, overheated, and inaccurate due to trying to shoot while wearing all that junk. That was just the infantry: the armor, artillery, close air support, and engineering divisions had also been selected and loaded for [[HollywoodTactics maximum visual effect and bragging rights]] for the news crews as opposed to [[CombatPragmatist maximum efficiency]] in actually destroying zombies.
* ''Literature/BraveNewWorld'' features an interesting variation. Riot police wear gas masks as they spray relaxing gas ('Soma', which is a common relaxant in the story), and then play a record of calming narration to dispel mobs, which fits with the novel's theme of dystopian control without direct oppression or bloodshed.
[[/folder]]

[[folder:Live-Action TV]]
* Federation troopers in ''Series/BlakesSeven'' -- although some do remove their helmets.
* The Breen from the ''Franchise/StarTrek'' franchise (especially ''Series/StarTrekDeepSpaceNine''). Explained by their homeworld being a frozen wasteland having a rather noxious atmosphere outside of which they can't survive. Although a few characters claim to have visited the Breen homeworld and say that it's actually perfectly habitable and at a comfortable temperature. The Breen apparently wear their environment suits and masks just to appear [[RuleOfCool enigmatic]]. It is said that no outsider has ever seen what one looks like beneath their masks and lived to tell of it.
* On ''Series/BabylonFive'', the Babylon 5 security personnel could be considered such by certain aliens, since parts of the station are filled with atmospheres for various exotic aliens, requiring oxygen-breathers to wear special masks (or to get gill implants, as some elect to do instead).
* An interesting example is ''Film/KamenRiderTheFirst''. The mooks wear Gas Masks, but are killed just as easily as in their skeleton-costume days (and they give the same "yee!" shout as they hop around!) The Shocker Greeed in ''Let's Go Kamen Riders'' has a gas mask apparently as homage, though ''The First'' and ''The Next'' aren't in main series continuity. Fewer appear in ''Film/KamenRiderTheNext'' and mostly in a non-combat role with foodsoldier work largely left to the [[EliteMooks Shocker Riders]].
* The colorful Wumpers in ''Series/GekisouSentaiCarranger'' look like they have gas masks. They made limited appearances in ''Series/PowerRangersTurbo'' as General Havoc's robots, and a [[PaletteSwap whitewashed one]] was used as the (ironically color-obsessed) and rather tough MonsterOfTheWeek, Chromite. To sentai fans, it must have looked like the Rangers were being owned by a ''single'' [[Series/MightyMorphinPowerRangers Putty Patroller]].
* Creator/AdultSwim -- [[http://www.bumpworthy.com/bumps/3852 They're smokin'!]]
* Borderline example: "The Empty Child"/"The Doctor Dances" on ''Series/DoctorWho'' set during UsefulNotes/WorldWarII. The "monster", a small boy, wore a gas-mask and was actually a zombie, who could control technology, could only say the words "Are you my mummy?", and [[spoiler:could convert everyone else to be just like him. Nothing says fun like watching a grown man gag as a gas-mask forces its way up his throat.]]
* ''Series/{{Arrow}}'': The armoured car bandits in "Trust but Verify", although they are actually using tear gas as part of their heists.
[[/folder]]

[[folder:Music]]
* Creator/PsychopathicRecords rapper Music/{{Jumpsteady}} typically appears in a bodysuit with gas mask when he associates with Music/InsaneClownPosse.
* Gas masks are a repeated visual in Music/FrankZappa's music, including the liner notes for ''Joe's Garage'' and the concert film ''Baby Snakes''.
** ''Weasels Ripped My Flesh'' included a song called "Prelude to the Afternoon of a Sexually Aroused Gas Mask."
* A gas mask is the IconicItem of Norwegian alternative rock band Music/KaizersOrchestra and is a common element in album art designs, sometimes cleverly hidden. The mask is worn by their organist during live performances.
* One constant about Thrash metal band Music/{{Sodom}}'s soldier mascot Knarrenheinz is the gasmask he wears.
[[/folder]]

[[folder:Music Videos]]
* The music video for Music/{{Disturbed}}'s cover of "Music/LandOfConfusion" has [[FacelessGoons corporate troopers]] in uniforms and gas masks to suppress dissent.
* The music video for Music/DaftPunk's song "One More Time", part of ''Anime/{{Interstella 5555}}'', already mentioned above in the animated movies section.
* [[http://www.youtube.com/watch?v=awCa4NGxTIA Wake up world and welcome to a land of devastating brutality where conflict is a part of every day life. It's a fucking walk in hell!]]
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/{{Warhammer 40000}}''
** Armageddon Steel Legion and the Death Korps of Krieg, among other Imperial Guard legions. Then again, they tend to live in places where the masks are a good idea for survival in general.
** The Death Korps also wear them [[spoiler:to hide the fact that they're clones, a practice which is frowned upon in the rest of the Imperium.]]
** In Creator/DanAbnett's ''Literature/GauntsGhosts'' novel ''Straight Silver'', both sides make extensive use of gas masks. Then again, they need them.
** The Chaos cultists in the Dark Vengeance box have a mixture of gas masks and other, cruder face-covering devices.
** Some Plague Marines have helmets reminiscent of gas masks.
* ''TabletopGame/WarhammerFantasy'' includes specialized Skaven wearing gas masks for protection against various airborne ills of their own devising; they are not named characters, making them mooks, but they are generally not cannon fodder, either.
* A lot of d20Modern artwork shows military-looking mooks (mercenaries?) in gas masks, apparently just for RuleOfCool. ([=PCs=] using chemical weapons are extremely rare, but it ''can'' happen.)
[[/folder]]

[[folder:Video Games]]
* ''VideoGame/HalfLife''
** The Combine Overwatch soldiers and Civil Protection officers in ''VideoGame/{{Half-Life 2}}'', as demonstrated above. Apparently, an early version of the script had City 17's air unbreathable, so that everyone wore gas masks. This was dropped, but the Combine gas masks weren't. It should also be pointed out that Overwatch soldiers required the mask to include their vocoder, due to their vocal cords being ripped out [[spoiler:(visible when you see the topless Overwatch model in Nova Prospekt)]], and Civil Protection officers would need them for anonymity, due to being rather brutal to citizens. The Gas Masks actually work against them at times. Using the "'bug bait" on a normal person gets no reaction, but using it on a Civil Protection Officer or an Overwatch Soldier causes them to flail about, apparently choking. That might just be because they're FriendlyFireProof.
** Some of the marines in the original ''VideoGame/HalfLife1'' also wore gas masks (including Adrian Shephard in ''Opposing Force'').
* The mourners in ''Videogame/RuneScape''.
* In ''VideoGame/FarCry'' for the PC, the toughest enemy soldiers are EliteMooks who are identified by the gas masks they wear. Why they do so is something of a mystery, as chemical weapons are never a factor, and it turns out that the mutagen the bad guys are toying with isn't even airborne.
* From the ''VideoGame/{{Wolfenstein}}'' series:
** In ''VideoGame/ReturnToCastleWolfenstein'', heavily armored Venom Troopers wear long greatcoats and gas masks. It's unclear ''why'' they do so, as none of the other enemy soldiers wear any sort of NBC gear. The gas masks only seem to serve as a message to the player that these guys can soak more bullets than normal soldiers.
** Same goes for the Drache Troopers in ''VideoGame/{{Wolfenstein|2009}}'', though, in their case, it could at least be argued that they need them to filter out the smoke produced by their flamethrowers (especially since they have a tendency to use them in confined spaces). The Veil Assassins and Heavy Troopers have no such excuse, though; rather, they wear gas masks because they are [[BodyHorror not]] [[StupidJetpackHitler exactly]] [[{{Ghostapo}} human]] [[SuperSoldier anymore]].
* ''VideoGame/{{Borderlands}}'': Some of the Atlas soldiers appear to be wearing gas masks. Far more visible (and numerous) in the Secret Armory of General Knoxx {{DLC}}.
* ''VideoGame/MedalOfHonor''
** Likewise, in ''Medal of Honor: Airborne'', the Mini-Boss-like Panzergrenadiers (guys with rocket launchers) and Nazi Storm Elites (guys with heavy body armor wielding MG42 machine gun turrets as portable weapons!) wear gas masks for no apparent reason other than to signal that they're supposed to be badass.
** ''Medal of Honor: Allied Assault'' has a rare [[JustifiedTrope justified example]]: the only soldiers wearing gas masks are the ones guarding the interior of the mustard gas factory in the game's final mission.
* In ''VideoGame/DeusEx'', some of the soldiers seem to incorporate light gas masks into their mouthpiece headgear. Oddly, these don't seem to provide any actual protection against tear gas grenades, or even against ''pepper spray''. That might be because tear gas and pepper spray are eye irritants -- since there's a global pandemic going on, it's probably not for protection against chemicals at all.
** ''VideoGame/DeusExHumanRevolution'' also has mooks with gas mask...that fail to protect them from gas grenades.
* In ''VideoGame/IronStorm'', enemy Siberian Troopers wear gas masks and heavy body armor. As per usual, the gas masks serve mostly to signal they're badass (they carry mini-rocket launchers that gib you in one hit) rather than to protect against NBC weapons. In fact, their gas masks are purely cosmetic and provide absolutely no protection against mustard gas grenades or LSD gas grenades.
* Umbrella Special Forces operative Hunk from the ''Franchise/ResidentEvil'' series is a rare example of a Gas Mask Mook with a name and his own story.
* Some late-game mooks in ''VideoGame/ResidentEvil4'' and ''VideoGame/ResidentEvil5'' wear gas masks. In ''4'', they're disturbingly sewed to Ganados' faces and make it slightly harder for Ada and Leon to [[YourHeadASplode elbow off their heads]], whereas the ones in ''5'' protect against headshots and make them immune to flash grenades. There's no reason for them in "5", although it's implied to be justified in "4": the exposed flesh of the gas mask wearing enemies is horribly mutilated, presumably from chemicals, and they can't take them off because, well, they're sewed on.
** Umbrella's {{Villain Protagonist}}s in ''[[VideoGame/ResidentEvilOperationRaccoonCity Operation Raccoon City]]'' wear them, which actually makes sense. The Army Specialists, however, don't.
%%* ''VideoGame/CallOfDuty''
* A number of the Ultranationalists in ''VideoGame/CallOfDuty 4: ModernWarfare'' wear gas masks, apparently just because they're cool. Some of the SAS troopers also wear them, but only for the sort of room-clearing missions where real life SAS doctrine does indeed call for gas masks for everyone, not because of gas but because their [[http://i227.photobucket.com/albums/dd287/lordtylerjp/AtlasSAS.jpg SF10 masks]] have tinted visors to help against flashbangs.
** A few of the Russian Federation paratroopers in ''VideoGame/ModernWarfare 2'' also wear gas masks, with no more in-story justification for them than they had in the first game.
* The SAS model in ''VideoGame/CounterStrike'' also wears a gas mask. [[GogglesDoNothing This does nothing to the effect of flash bangs.]]
* ''VideoGame/CommandAndConquer''
** All Nod soldiers in ''VideoGame/CommandAndConquerRenegade'', except for plot-important {{NPC}}s. May be more justified, there since Nod likes to toy around with [[KillItWithFire Napalm]] and [[GreenRocks Tiberium]]. Not that the superiors seem to care much about safety... (this was most likely due to limitations in the game as seeing the same face on every soldier you killed would get boring, and also to try and skirt around censorship in Germany, much like the original C&C renaming civilians "farmbots" for the German release).
** Soldiers from both sides wear full environment suits in ''VideoGame/CommandAndConquerTiberianSun'', but the GDI uses helmets with a transparent faceplate, while the Brotherhood of Nod uses face-concealing ones.
** Ditto for the Soviet conscripts (basic infantry) in ''VideoGame/CommandAndConquerRedAlert2'', even though the game doesn't feature any chemical warfare until ''Yuri's Revenge''. In ''VideoGame/CommandAndConquerRedAlert3'', the conscripts lose the gas masks and just wear the stereotypical Russian ushanka hats.
* Black Hole infantry in ''VideoGame/AdvanceWars'' come close, wearing space helmets for no real purpose other than to make them look more alien. In fact, they ''are'' aliens! It's stated outright in the second game that they've arrived from space.
** The Xylvanian rifle grunts of sister series ''VideoGame/BattalionWars'' wear full gas masks, both because Xylvania is dangerously polluted and because their military is big on chemical warfare -- the Xylvanian equivalents to Flame Vets are ''Acid Gas'' Vets.
* ''VideoGame/{{Killzone}}''
** The Helghast wear gas masks all the time and are most likely inspired by the Wolf Brigade from Jin Roh (see above). However, the game somewhat explains them wearing these. Since their home planet has a toxic atmosphere with little light and the people on it have gotten used to it (more or less), their soldiers require these masks because normal atmosphere and light makes them weaker. They invert the normal purpose of gas masks by toxifying breathed-in air.
** And yet, you get to invade the Helghast homeworld in ''Killzone 2'' and they ''still'' wear masks and your side doesn't. The [[AllThereInTheManual game's official website]] explains that the Helghast dictator's propaganda has turned the masks (which the inhabitants of Helghan wore before they adapted to the planet's atmosphere) into a symbol of their fortitude, thus they wear the masks in other planets out of necessity, and in their home planet for symbolic reasons. Some of the EnemyChatter even [[LampshadeHanging hangs a lampshade on their choice of dress]] in a somewhat humorous fashion:
-->'''Helghast 1:''' Did you hear? Two grunts from our unit got executed by Radec?\\
'''Helghast 2:''' No shit? What for? Cowardice? Defeatism?\\
'''Helghast 1:''' Uniform violations. I shit you not.\\
'''Helghast 2:''' "The Dress Code is the foundation of discipline..."
* In ''VideoGame/RiseOfLegends'', the Vinci hero character Pulitore, who has poison gas-based powers, as well as the Doge's Elite Guard super infantry, all wear gas masks. The doge himself uses a lot of gas attacks, so it makes a bit of sense. Pulitore is immune to gas effects, but the elites aren't.
* ''VideoGame/MetalGearSolid''
** ''Metal Gear Solid'' gives us the NoFourthWall boss Psycho Mantis, who's easily the quirkiest of the QuirkyMinibossSquad. He wears a gas mask, although it's for a good reason: it keeps him from hearing the thoughts of everyone in the general vicinity, covers his badly scarred face which even ''he'' can't stand the sight of, and it's suggested late in the game that he was [[spoiler:unaffected by the [=FoxDIE=] virus thanks to the mask.]]
** The Tengu Commandos in ''Metal Gear Solid 2'' and the Haven Troopers in ''Metal Gear Solid 4'' wore full-body exoskeletons, with their helmets appearing to have some sort of filter. The filter is more prominent in the Haven Troopers, but it doesn't stop sleeping gas.
** Then there's the mooks that actually wear gas masks in the area that the nuclear heads are stored in from [=MGS1=]. And that area actually does get flooded with poison gas if you are spotted.
* ''VideoGame/{{Fallout}}''
** Both subverted and used in ''VideoGame/{{Fallout 3}}'' (and somewhat in other games of the series), where a group of enemies use gas mask-like PoweredArmor, but so do a neutral group, a good group, and sometimes even the player. Lampshaded in that some power armor helmets lower charisma when you use them. Specifically, the Enclave power armor helmets. It's also {{justified|Trope}} as heavy dosages of radiation are found throughout the wasteland. Additionally, most of the soldiers that ''do'' have them aren't really mooks, they are some of the best trained soldiers on the face of the earth (or at least the US).
** Actual gas mask-masked potentially hostile folks show up in [[VideoGame/FalloutNewVegas the Mojave Wasteland]], but the Veteran Rangers have that same "too good to really be called mooks" thing as mentioned above and, to a person working for the NCR, are a generally good group.
** The Ghost People in the ''Dead Money'' expansion of ''VideoGame/FalloutNewVegas'' are a more traditional example, being mute, numerous, and universally hostile. They're also extremely agile and strong and don't die unless dismembered or disintegrated (or unless you learn the perk from Dog).
** Also, the Lobotomites from ''Old World Blues''. They may seem like mindless cybernetic zombies at first, but they can both dish out damage and take it, and are quite accurate with firearms.
* While there are no gas-based weapons in ''VideoGame/{{STALKER}}'', the gas masks and full face helmets on certain suits do make sense as those are the ones which grant the highest radiation protection, and one way they do so is by filtering out radioactive particles in the air. Just about every non-plot essential NPC wears either gas masks or face wraps, probably to save time on lip syncing.
** It should be noted, however, that there are, indeed, gas based anomalies which manifest as toxic green clouds hovering in the air, occasionally with some manner of green liquid condensing and dropping down to the ground. Not something you want to breath in without protection.
* Justified in the ''VideoGame/{{Halo}}'' series, where the grunts are methane breathers and require respirators in oxygen atmospheres. Inversed as well, as they are the weakest mooks. The Heretic Elites wear gas masks as well, although the Covenant Elites don't use them in the same environment (the gas giant Threshold).
* All human soldiers in ''VideoGame/DarkSector'' wear gas masks, but this is justified in that they are fighting TheVirus.
* Skeleton soldiers from ''VideoGame/{{Painkiller}}'' wear gas masks, but since they are animated skeletons already, it is just another nonsensical element. It does give them a distinct battle cry, and soldiers of a certain era could have died in those gas masks, hence the reason they're still wearing them.
* The Special Forces soldiers who assault the Mall in ''VideoGame/DeadRising'' are a whole different game than the zombies. They've got the firepower to really ruin a player's day.
* Used in ''VideoGame/InFamous'' as part of a general FacelessMooks policy. Ironically, a gas weapon is used against them completely effectively as part of the plot, so it's not even a victim of GameplayAndStorySegregation; the writers just forgot they had gas masks on.
* The Forsaken Plaguebringers in ''VideoGame/WorldOfWarcraft'' wear gas masks while handling their optimized plague.
* Lampshaded in ''VideoGame/{{Manhunt}}'', as the Cerberus guards wear them, but [[NoPeripheralVision complain about not being able to see]].
* In ''VideoGame/{{Prototype}}'', the [[ArmiesAreEvil Black]][[FacelessGoons watch]] all wear gas masks, apparently a standard part of their gear as a division commissioned to deal with biohazards. The unusual triple configuration of the eye and mouth filters makes them look much less human, something intended by the developers.
* Strangely absent in ''VideoGame/RiseOfTheTriad'', because there are several rooms where poison gas is released. It'll eventually kill any enemies in the room.
* The Park Drones in ''VideoGame/CrashTagTeamRacing''.
* Introduced in ''VideoGame/SuperMarioBros2'', Snifits are best known for using their masks to spit projectiles. It wasn't until ''VideoGame/PaperMarioStickerStar'', more than two decades later, that their masks were used for toxic purposes.
* ''VideoGame/BatmanArkhamAsylum'': Scarecrow wears a particularly nightmarish [[http://www.spermio.com/portal/wp-content/uploads/2009/08/scarecrow-arkham.jpg version]]. Justified, since he sprays around his terrifying gas frequently.
* In ''VideoGame/DestroyAllHumans 2'', some of the Soviet troops in Tunguska play this trope straight by wearing gas masks, while others do not. Gas mask or not, the soldiers are heartless, yet expendable mooks at the end of the day. Potentially justified in how [[spoiler:Tunguska is home to some dangerous radioactive and alien gases, some of which can cause mutation in alien mooks.]]
* One of the enemy types in ''{{Uncharted}} 2'' wears a completely unnecessary gas mask.
* ''VideoGame/{{Alundra 2}}'''s BigBad's MechaMooks wear gas masks.
* Pretty much 90% of the NON-mooks you slaughter in ''VideoGame/RevolutionX'' (Music/{{Aerosmith}}'s official arcade game) wear gas masks.
* The Baknamy in ''VideoGame/FinalFantasyXII''.
* PSICOM soldiers from ''VideoGame/FinalFantasyXIII''. Although they don't look exactly like real gas masks and it could just be the helmet for their PoweredArmor, but it's never specified one way or another.
* In the Hunter multiplayer mode of ''VideoGame/SplinterCell Conviction'', the last part of each stage has these. In the Washington Monument stage, a GasLeakCoverup is used to evacuate the fairgrounds, and the Black Arrow troops sent in to get Sam are outfitted appropriately to the excuse.
* Some of the enemies in later missions in ''VideoGame/SWAT4'' wear gas masks, making them immune to your tear gas.
* The Pig Mask Army in ''VideoGame/{{Mother 3}}'' is exactly this. The masks are just meant to make them look more pig-like.
* One of many elements that ''VideoGame/SilentHillHomecoming'' borrowed from [[Film/SilentHill the movie]], although you don't actually get to fight them until around the end of the game.
* ''VideoGame/{{Bug}}!'': An enemy in [[BubblegloopSwamp Splot]] wears a gas mask. Justified, as its main method of attack is to turn around and ''[[{{Fartillery}} fart in Bug's face]]''!
* City Watch soldiers in ''VideoGame/{{Dishonored}}'' wear surgical masks over their faces and the Whalers wear full-on gas masks. Justified due to the high presence of plague in the city and hazardous fumes at work.
** Assassins also wear whaler's gas masks that were taken from the abandoned whale oil refinery.
* In ''VideoGame/{{Brink}}'', certain head/face parts turn characters into GasMaskMooks. The Resistance have "The Firestarter" (though it may not be an actual gasmask) while Security has "The Bouncer", "The Shield", and "The Unit", though the latter doesn't make the wearer anonymous as it's the more modern style with a large visor instead of two eye holes.
* The G22 operatives from ''VideoGame/AlphaProtocol''. Their blue-lit visors are remarked upon in game.
* Dr. Regal's minions in ''VideoGame/MegaManBattleNetwork 5''.
* Everyone who journeys above ground in ''VideoGame/{{Metro 2033}}'' needs to bring a gas mask, unless they plan on holding their breath. The proliferation of GasMaskMooks is actually quite helpful, as stealing their air filters keeps you alive.
* Verminators wear gas masks in ''VideoGame/RabbidsGoHome'', not because of some toxic hazard, just because they're obsessed with germs and neatness. However, it doesn't need so much effort from the player to put that mask away...along with every other garment Verminators wear.
* The Urban Replica Soldiers in ''VideoGame/FirstEncounterAssaultRecon'' wear one of these, along with the helmet standard among Replicas. They're the second weakest type of Replica in the first game, but their badass look makes up for it.
* The [[BadassArmy Black Egrets]] of ''VideoGame/{{Skullgirls}}''; however, despite the presence of gas masks and their [[PuttingOnTheReich aesthetic]], they work for [[RoyalsWhoActuallyDoSomething Parasoul]], who seeks the destruction of the Skull Heart responsible for creating the titular being, making them good guys.
** Also to note, DLC candidate Panzerfaust is also one of Parasoul's mooks, although he's a bit more special in that he has a [[PowerFist TANK for an arm/fist]].
** Notably averted by [[EliteMook Adam]], who is the only fully-uniformed soldier we see [[HelmetsAreHardlyHeroic without a helmet]].
* Numerous enemies in the ''Franchise/MassEffect'' games wear armor that includes a helmet that resembles a gas mask, but this serves a practical purpose despite the main character not having any chemical warfare ability because armor in the game doubles as space suits, so it would need to be sealed against vacuum.
** Played straighter with the Cerberus troops in the third game, because their helmets actually resemble gas masks.
** Even Shepard can get in on it; the Death Mask helmet in the second and third games resembles a gas mask, despite functioning the same way as any other helmet. [[RuleOfCool But it looks really badass.]]
** Although they're on your side, the quarians and volus would also qualify. Of course, quarians risk serious illness or death if they ''don't'' wear an environment suit, and volus will just straightforwardly ''burst'' without the pressure suit, so at least they have a reason.
* ''VideoGame/SoldierOfFortune II'''s Prometheus troopers, and the hazmat/NBC soldiers in the first game.
* In both ''VideoGame/PlanetSide'', gas masks are the go-to choice for [[TheEmpire Terran Republic]] soldiers - in the first game, their Reinforced Exosuit armor totes a heavy gas mask. In ''Planetside 2'', ''all'' TR infantry classes can get gas masks with the [[MicroTransactions game's customization]] - The various Composite helmets give them small gas masks which cover their face below their trademark goggles. The [[http://i.imgur.com/Gi7fUkG.png Dreadnought helmet]] is a [[Franchise/StarWars Stormtrooper]]-esque helmet which hides their entire head. However, none of the gas-masks ([[GogglesDoNothing or their goggles]]) have any effect on gameplay.
* In 1997 First-Person Shooter ''VideoGame/ChasmTheRift'' (first game devepoped by Action Forms, creators of ''{{VideoGame/Cryostasis}}'') all human enemy soldiers wear gas masks.
* ''VideoGame/StarWarsTheOldRepublic'' contains several gas masks and gas mask-like helmets that the player can equip. [[CompetitiveBalance They do nothing against any gas-based attacks]].
[[/folder]]

[[folder:Web Comics]]
* Henderson Security from ''SupernormalStep''
** The masks in this case were originally intended to avert the dehumanization associated with this trope because they served as a means of preventing racial tension towards Henderson Security's diverse work force. By the time of the comic, however, this had become a minor issue and the masks were simply maintained as a symbol of their position. For the reader, the masks are meant to have the typical effect.
* Every single character in ''GoneWithTheBlastwave'' is one of these, unless you want to count the giant mutant moth. The markings on their helmets, which seem to indicate their roles in the unit, are the only way to tell them apart. It's not clear whether this is just a defensive measure in the war they're fighting or whether the post-apocalyptic setting makes it necessary for survival. Either way, it adds to the general theme of the characters being faceless mooks in a war they don't understand or particularly care about. [[http://www.blastwave-comic.com/index.php?p=comic&nro=50 Page 50]] filler shows "25 essential expressions" on these.
* The four protagonists of ''Webcomic/RomanticallyApocalyptic'' (Sniper, Captain, Pilot, and Engineer) all wear gasmasks, though this may be because of the rather eccentric captain. Lampshaded in a flashback scene in which a pre-apocalypse child version of Captain still insists on wearing a gasmask.
* The members of Senator Madder's "security detail" in ''TalesOfGnosisCollege'' appear to be Gas Mask Mooks.
[[/folder]]

[[folder:Web Original]]
* ''TheFearMythos'': one of the Archangel's recurring minions is a gas-masked sniper.
[[/folder]]

[[folder:Western Animation]]
* Destro's Iron Grenadiers from ''Franchise/GIJoe''.
* In [[HarmanAndIsing Rudolf Ising's]] [[TheGoldenAgeOfAnimation 1939]] anti-war cartoon ''PeaceOnEarth'', the now-anthropomorphic animals recall how Man finally wiped himself out in one final war. The grimness of these sequences is hyper-accentuated by their never-removed gas-masks which seem to run the length of their whole bodies. The two last ones shoot each other dead before falling into the muck and mud, ever faceless.
* The Equalists from ''WesternAnimation/TheLegendOfKorra''. Rather unusually, as there doesn't seem to be any particular ''reason'' for them to be wearing gas masks -- at least, not yet.
** As of Season 1 Episode 3 "The Revelation", they do have a reason. A pair of [[BadassBiker Badass Bikers]] throw some kind of gas grenades/smoke bombs to cover their escape, and their masks protect them from the green gas. The masks also fit with the anonymity cultivated by their leader Amon, who wears a WhiteMaskOfDoom, albeit an opera mask not a gas mask.
* The Terras in ''{{WesternAnimation/Motorcity}}'' wear these, as [[spoiler: their faces are mutated due to toxic waste dumped by Kane Co.]]
[[/folder]]

[[folder:Real Life]]
* Very much a TruthInTelevision, as various SWAT and Counter terrorist teams wear gas masks regardless of whether they're going to use gas or not. Two reasons for this: a) preventative measures in case who they're going against does or if they themselves decide to use tear gas or smoke grenades and dust that would be thrown up by entry charges and b) the psychological effect it has on the enemy inside the building they're about to storm. Many gas masks are also compatible with flash reduction lenses, which means the wearer is less vulnerable to flash grenades.
** Possibly the most iconic example would be the [[http://en.wikipedia.org/wiki/Iranian_Embassy_Siege Iranian Embassy Siege]], where [[BritsWithBattleships Special Air Service]] operators retook the embassy after a six-day siege. One of the more iconic images of the event were the [[http://www.militaryimages.net/photopost/data/550/58Embassy_6.jpg images]] people watching the news or reading the paper got to see of darkly-dressed SAS operatives wielding [=MP5=] submachine guns and sporting bug-eyed lens gas-masks. It's a look that has carried over to a lot of other media depicting counter-terrorist and special operations forces.
* It's not wholly fair to call them evil, but they're almost certainly the source of this trope: during UsefulNotes/WorldWarI, a lot of German soldiers wore gas masks because of all the chlorine gas they were using in battle, most famously at Ypres.
** In the awkward segue between horse and vehicle warfare, horses sported some variety of mask.
** The Allies started to issue gas masks once they were fully developed. They didn't wear them constantly because they were incredibly uncomfortable, and you could actually choke in one if you didn't switch the filters often enough.
*** The above PhilipKDick quote comes from the notes of one of his stories, where he is remembering his father, a UsefulNotes/WorldWarI veteran, showing him the mask when he was a child.
** The [[SemperFi US Marines]] have a nickname they're fond of that they claim to have been given by the Germans, ''Teufel Hunden'', meaning "Devil Dogs", attributed to reports from the Battle of Belleau Wood where Marines wore bulky gas masks and clawed their way up a steep hill to get at the Germans, foaming at the mouths from the heat and exertion. Supposedly, this gave them a hellish, [[ShapedLikeItself dog-like appearance.]] [[note]]Worth noting, nobody's ever found any evidence that these German reports ever existed, nor are there any accounts from the Germans of them actually calling the Marines this, plus the fact that "Teufel Hunden" would exhibit remarkably poor grammar in German. That said, the story is still highly entertaining and very [[RuleOfCool cool]][[/note]].
*** "Teufelshunde" is actually gramatically correct German.
** Chemical weapons were not used prominently in Europe during World War II, not even by Nazi Germany, because, aside from the majority of German transport being comprised of horses, both sides had lived through such a horrible experience with them in the last war that they were terrified of using them again. There was a tacit understanding that if either side started using chemical weapons, the other side would retaliate with their own chemical weapons, and escalation would soon lead to whole armies and entire cities being nerve gassed. Each side had spent the past two decades living with thousands of wounded soldiers crippled by exposure to poison gas, the reality of these weapons had really hit home, so they never seriously considered using them.
*** That wasn't to say that the Germans didn't have poison gas - they made tons of the stuff, but Hitler refused to use it (because of his own experience with gas in WWI). The UK also stockpiled chemical arms, which would have been used against a German invasion.
*** Even the Japanese, who hadn't fought on the Western Front and who were willing to use chemical and biological weapons against the Chinese, were terrified that the United States would resort to chemical warfare attacks against their defensive tunnels on the Home Islands. This is why they never used chemical weapons, even when their home territory like Okinawa was being invaded. Their military central command issued explicit orders never to do anything that might provoke the Americans into using chemical weapons, such as specifically using chemical weapons on American troops.
*** Of course, the much more mobile nature of WWII combat also made chemical weapons far less useful. It's easy to resist the temptation to use gas when it doesn't do much good anyway.
* Iraqi soldiers fit this well enough as they utilized chemical weapons against Iran.
** As well as against Kurdish villages on their own territory.
* During the Cold War, every country manufactured masks to protect themselves from chemical and biological weapons. The Soviets created many masks that represented human skulls which were intended to also have a psychological impact on enemy troops. These mask designs were used in ''Half-Life 2'' and other dystopian fiction. Also, many Russian families keep these skull masks just in case, and Russian truckers like to put these masks on the necks of their trucks' diesel tanks.
** Even after the Cold War, new masks are being designed and produced, as various improvements are made (usually in terms of comfort and durability) and old equipment wears out or becomes obsolete.
[[/folder]]
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