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During the development of Call of Duty games many things are cut during the process. These changes can range from weapons and characters to entire campaign missions and features.

Call of Duty 2

Cut Weapons

Assault Rifles

FG42 - Sounds, images, models, textures and the pickup icon still remain.

Launchers

Panzerfaust 60 - Low-resolution texture sheets and HUD icons are still in the game files, alongside seemingly-working animation strings, sound files, and the coding string "panzerfaust_mp".
The FG42's pickup icon, found in the game files.
The FG42 weapon texture, found in the game files
The Panzerfaust's pickup icon, found in the game files.
The Panzerfaust's weapon texture, found in the game files

Cut Multiplayer Maps

EffectsEd box - Default map cut from the game used for testing effects.

Cut Vehicles

Panther - Sound files were found in which a Russian says "They got a Panther tank!"

Cut Characters

V. S. Zubov - Sound files suggest a character from the first Call of Duty was going to appear.

Call of Duty 4: Modern Warfare

Main article: Cut Content/Call of Duty 4: Modern Warfare

Call of Duty 4: Modern Warfare DS

Main article: Cut Content/Call of Duty 4: Modern Warfare DS

Call of Duty: World at War

Main article: Cut Content/Call of Duty: World at War

Call of Duty: Modern Warfare 2

Cut Campaign Missions

Tulsa - Cut single-player mission.
Shipment - A planned motorcycle level.
Downtown LA - Another motorcycle level; also a planned multiplayer map.
International Space Station - A mission that was scrapped in favor of the mission Second Sun.
Roadkill - Game files and concept art remain.

Cut Dialogue from "Of Their Own Accord"

The Washington Monument evacuation site doesn't drop below 80% combat effectiveness due to cut dialogue which can be retrieved from the PC version which shows the various dropping of combat effectiveness percentages, combat personnel dying where civillians desperately take arms and fight back to even "Overlord" taking a last stand as the enemy comes forth within the evacuation site.

Captain Price Mission Change

Captain Price was originally to appear in the mission Cliffhanger, and the player would control John "Soap" MacTavish.

Cut Weapons

Assault Rifles

L85 - Cut assault rifle. Its model was modified and then turned into the L86 LSW later in development. The L86 LSW's pickup icon in multiplayer still depicts an L85 rifle.
M14 - Numerous unused textures remain in the game files.
G3 - Is mentioned briefly in a few files.
G36C - Textures still remain, along with the Call of Duty 4: Modern Warfare Red Dot Sight attachment.
STG-44 - Create-a-Class images still remain.

Submachine Guns

AK-74u - Texture files remaining.

Shotguns

Remington 870 - Its texture sheet remains in the game files.

Pistols

Gold Desert Eagle - Almost functional, with files from Call of Duty 4: Modern Warfare.

Weapon Changes

Thumpers - They were initially meant to have Akimbo.
TMP - Originally a primary before being changed into a secondary.
PP2000 - Originally a primary before being changed into a secondary.
The player originally could have had the option to throw the Throwing Knife either left or right.

Cut Attachments

MG4 Scope - The MG4 originally had its own scope, with texture files remaining.

Cut Equipment

Instead of the Tactical Insertion, a lightstick was planned. The player would crack the lightstick and then put it down.
Power Drill.

Cut Perks

Blackbox - Longer killstreak duration.
Siege - Immobile but greater accuracy.
Amplify - Hear enemy footsteps louder.
Freerunner - Mantle obstacles faster.
Dive - Jump to dodge bullets.
Spy Game - No name above the player or red crosshair when targeted.
Burst Fire - Weapons fire three-round bursts.
Improved Iron Lungs - Even longer breath when holding steady.
Feign Death - The player can fake a death.
Offhand - Use equipment in Final Stand.
Saboteur - Complete objectives quicker.
Explosive Bullets - Bullets explode on impact.
Free Fall - No fall damage.
Thermal Vision - Enemies appear white hot.
Steel Nerves - Improved marksmanship.
Rear-view - Minimap is replaced with rear-view.
Challenger - Extra experience points but easy death.
EMP Grenades x3 - Increase capacity for EMP Grenades.
Primary Stand - Weapon of choice in Final Stand.
Flash Grenades x3 - Increase capacity for Flash Grenades.
C4death - Pulls out C4 before death.
Shellshock - Riot Shield on player's back.

Cut Killstreaks

Tank
Predator Airdrop
Super Airstrike
Auto-Grenade Launcher
Helicopter Blackbox
Littlebird
Shotgun
Advanced UAV
Helicopter MK19
Airstrike
Thumper

EMP Announcement

When an EMP is detonated, the announcer will signal over a radio. Original audio files were said normal, not over a radio.

Cut Vehicles

MH-6 Little Bird - Although it can be seen in campaign, the MH-6 Littlebird was also meant to be a killstreak in multiplayer mode.
L-Train - A image remains of an interactive train meant for a multiplayer map. A kill icon remains.

Cut Multiplayer Maps

Vertigo - Set on top of a building.
Oil Rig - Set on an oil rig.
Gulag - Based on the campaign mission The Gulag; the map description reads "Night time jail fight. Large scale russian prison fighting".
Riverwalk - Scrapped multiplayer map.

Cut Gamemodes

Die Hard - Basic game, but every player is given a final stand, and players in final stand are marked in green on the minimap.
Arms Race - Only sound files remain.
VIP - Similar to Capture the Flag, but a player is selected randomly to be protected by their teammates.
Defcon - Each one of the five decons changes the player and the game, and are added on until Defcon 1 is reached.
Arena - Team Deathmatch but all players only have one life. When there is one player alive on each team left, a flag spawns and teams must control it.
Global Thermonuclear War - Teams have to guard the bomb until it goes off and a nuke ends the game.
One Flag Capture the Flag - Similar to Capture the Flag but instead with only one flag.

Cut Camouflage

Blue Cheetah

Sources

Call of Duty: Black Ops

Cut Weapons

MP5 - Only a HUD icon remains. It used the model from Call of Duty 4: Modern Warfare.
M4A1 - The M4A1 was cut from the game and used the model from Call of Duty 4: Modern Warfare. It was used for testing the Commando.
M16A4 - The M16A4 was cut from the game and used the model from Call of Duty 4: Modern Warfare. It was used for testing the M16.
Model 1887 - Although can be used in the campaign mission Vorkuta, coding suggests it was going to be used in Redemption, Rebirth, and Payback. More coding suggests it was also usable in multiplayer.
M249 SAW - It was going to be used in the game, but it was cut during development. It still appears in the game in the mission Vorkuta. It had the same model as the one from Call of Duty 4: Modern Warfare.
M60E4 - Used for testing the M60.
RPD - It was supposed to be in game but was cut and later replaced by the RPK. It used the model from Call of Duty 4: Modern Warfare.
Barrett .50cal - The Barrett .50cal was cut from the game and used the model from Call of Duty 4: Modern Warfare.
P38 - A pickup icon still remains. Steiner can be seen carrying it in Project Nova.
Datamined pickup icon of the P38.

Cut Equipment

Satchel Charge - The Satchel Charge was cut from the game. It has the same model as the Call of Duty: World at War model. It was replaced by the C4.
N° 74 ST - The N° 74 ST was cut from the game. It has the same model as the Call of Duty: World at War model.
Acoustic Sensor - The Acoustic Sensor was cut from the game.
Flare - The Flare was cut from the game.

Cut Multiplayer Perks

Second Chance - The perk originally had a unique animation in which the player's character would shoot themselves in the head when the player opted for the Coward's Way Out. This was cut from the final game due to the ESRB's strict rules about depicting suicide in video games.
Stopping Power - It was going to be in the game, but was cut during development. It was replaced by the Hardened perk. The Call of Duty: Black Ops (Nintendo DS) version of the game still includes Stopping Power.
Extreme Conditioning - It was going to be in the game, but was cut during development. It was replaced by the Marathon perk. The Call of Duty: Black Ops (Nintendo DS) version of the game still includes Extreme Conditioning.
Satchel Charge x2 - It was going to be in the game, but was cut during development.

Cut Killstreaks

AC-130 (killstreak) - Originally the AC-130 was going to be in the game, but it was cut during development. The weapons in the gunship still appears in the game files.
Artillery - The Artillery was going to be in the game, but it was cut during development.
Flyable Heliocopter - There's a streak called a "Flyable Heliocopter", but it was cut during development.
Recon Plane - The Recon Plane was going to be in the game, but it was cut during development. It was replaced by the Spy Plane .
Activate AA Gun - There's a streak called a "Activate AA Gun", but it was cut during development.

Cut Multiplayer Maps

War Museum - Cut multiplayer map based around a war museum that was decorated with paintings, medals and bronze statues.
Munich - Early version of the DLC multiplayer map Stadium.
Landing - Cut multiplayer map based around a landing strip, possibly set within Vietnam.
Port - Cut multiplayer map based around a winter shipping port.
Jungle - Different from the map Jungle in multiplayer, this map takes place with a storm occurring at an NVA military base.
Uranium - An unused multiplayer map found within the game files, little is known about this level.
Golf Course - Early version of the DLC multiplayer map Hazard.
Snow Mine - All that remains is the map's description, "Winter combat in a deserted mine. Great for objective-based game modes."
Pentagon - Was originally a multiplayer map, later turned into the Zombies map, Five.^{[source needed]}
Rooftops - Cut multiplayer map that takes place on the rooftops of several interconnected buildings.
Underwater - Cut multiplayer map based around an underwater facility, possibly based on the campaign mission Redemption.
Sandstorm - Cut multiplayer map set within some kind of industrial facility. Contrary to the name, there does not seem to be any sand in the map.
Airbase - Cut multiplayer map. Although the map itself is completely unknown, it can be fully and accurately reconstructed as seen here.
Sea Lab - Cut multiplayer map set within an underwater facility.
Havana - Different from the map Havana in Multiplayer, the map resembles Favela from Call of Duty: Modern Warfare 2.
Shipyard - Cut multiplayer map based around a shipping port.

Cut Gamemodes

Boot Camp - Boot Camp was going to return to Black Ops, but it was cut in the final game.
War - War mode was going to return to Black Ops, but it was cut in the final game.
Veteran - Veteran was going to return to Black Ops, but it was cut during development.

Cut Zombies Weapons

Sabertooth - Cut chainsaw intended for Zombies.
M2 Flamethrower - Besides being in Dead Ops Arcade, voice clips suggest it was intended for Five and Kino der Toten.
AK47 - The AK-47 in Zombies is half finished. It cannot be pack-a-punched and is missing gun sounds. However, the pack-a-punched variant still remains, The Red Mist. The Red Mist is fully completed and has a Flamethrower attachment.
Grim Reaper - It has working sounds but does not have Pack-a-Punch texture.
Uzi - Game files suggest it was supposed to appear in Zombies.
KS-23 - Game files suggest it was supposed to appear in Zombies.
Extra Pack-a-Punched Variants - Cut Pack-a-Punch variants include theKiparis, the WA2000, the Stoner63, and the Skorpion.
Unlike the other cut weapons, the MAC11, the Enfield and the M60 have working sounds and existing Pack-a-Punch textures.

Cut Zombies Perks

Candolier - Appears in game files. It was most likely going to act similar to Bandolier from Call of Duty 4: Modern Warfare by giving the player extra magazines. This concept returned in Black Ops 4 Zombies with the perk Bandolier Bandit.
BoomJuice - Appears in game files. It was intended for the map Ascension but was replaced by PhD Flopper.
DptBoom - Appears in game files. It was intended for the map Ascension but was replaced by PhD Flopper.
Pronaide - Appears in game files. It was intended for the map Ascension but was replaced by PhD Flopper.
Tufbrew - Appears in game files. It was intended for the map Ascension however it's functionality is unknown.
Datamined icon of the Candolier perk.

Cut Zombies Enemies

Unused game files suggest that Hellhounds were to be fought in Five.

Cut Zombie Maps

A Paris map was intended for zombies, but was later replaced by "Moon"

Sources

- https://tcrf.net/Call_of_Duty:_Black_Ops

- Call of Duty: Black Ops - Mod Tools (Beta)

- https://www.youtube.com/watch?v=C0mQPEtjiR0 1:23

- https://www.youtube.com/watch?v=LHIjGesibaI

Call of Duty: Modern Warfare 3

Cut Weapons

Assault Rifles

FAMAS - Was planned to be used by GIGN, but it was cut on early development.
F2000 - This gun was used for a cut killstreak as a Target Laser, and ported from Call of Duty: Modern Warfare 2.
MP44 - Gun files from Call of Duty 4: Modern Warfare still remain.
M21 EBR - Uses Call of Duty: Modern Warfare 3 engine images, suggesting being cut late in development.
TAR-21 - Images still remain.

Submachine Guns

Vector - Was planned to be in the game and it was even seen on early trailers.
AK74u - Appeared in campaign, but Create-a-Class icons exist.

Shotguns

Ranger - Create-a-Class images remain.
M1014 - Uses Call of Duty 4: Modern Warfare weapon files.

Light Machine Guns

M240 - Was cut late in development. However, it still appears in the Wii version of the campaign level Goalpost.
RPD - Appeared in a few trailers, but was cut from the game.
AUG HBAR - Was planned to be in the game but was cut. Game files remain for it.
MG42 - Call of Duty: World at War HUD icons remain.

Sniper Rifles

Intervention - Uses Create-a-Class images from Call of Duty: Modern Warfare 2.

MK12 SPR - M4A1 with RSASS scope and bipod.
Lee-Enfield - Cut from game, and uses cut icons from Call of Duty: World at War.

Pistols

M1911 - Create-a-Class images from Call of Duty 4: Modern Warfare still remain.
M93 Raffica - Create-a-Class images still remain.
M9 - Create-a-Class icons from Call of Duty: Modern Warfare 2 still exist. It can still be found in some campaign missions.
Gold Desert Eagle - Uses images from Call of Duty 4: Modern Warfare.

Machine Pistols

PP2000 - Bump maps still remain.
TMP - Create-a-Class icons from Call of Duty: Modern Warfare 2 still exist.

Launchers

AT4 - Seen in early E3 game trailers.

Cut Perks

Extended Mags - Works just like the attachment does in the final game.
Blackbox - Cut perk from Call of Duty: Modern Warfare 2, would increase amount of time for air Killstreaks.
Akimbo - Works just like the attachment does in the final game.
Challenger - Would double the amount of XP earned for the trade of lower health.
Remote MG Turret
Tactical Insertion - Was seen in Call of Duty: Modern Warfare 3's mutliplayer reveal.
Javelin x1- Cut because Javelin was made a weapon, instead of a toggle-ability.
Saboteur - Capture objectives faster.
Stinger x2 - Cut because Stinger was made a weapon, instead of a toggle-ability.
Freerunner - Run for an infinite amount of time.
Shellshock - Attached a Riot Sheild on player's back, less damage would be dealt on back.
Burst Fire - The player's gun shoots in 3 round bursts.
Siege - Player cannot move, but gains better recoil and accuracy.
Endgame - Multiplies the player's health x4, but player's life only lasts 10 seconds.
Anytwo - Allows player to choose any perk for Slot 2 and Slot 3, but Anytwo takes Slot 1.

Cut Deathstreaks

Copycat - Copy the player's killer's class during KillCam.
Heartbreaker - Player is invisible to enemy Heartbeat Sensors.
Painkiller - Increase amount of health for limited amount of time at spawn.

Cut Gamemodes

Grinder - Not much is known about Grinder, except there was Hardcore Grinder and the objective was to get to the target area.

Cut Multiplayer Maps

Alps
Meteora - Early version of Sanctuary.
Plaza - Early version of Arkaden.
Warlord - Uses files from "Back on the Grid".
Brooklyn
Coast - This map has ties to "Piazza" and is similar to "Black Box".

Cut Spec-ops Missions

Assualtmine- Shares similarities to Fire Mission.
Defend_Ferris - This mission had the player defend the Ferris Wheel in Pripyat from Call of Duty 4: Modern Warfare.

Unfinished ACR Camouflage

The ACR has a white camouflage that is not known to be any kind of camo in game.

Cut Camouflages

Sources

Call of Duty: Black Ops II

Cut Weapons

Assault Rifles

M4 - Cut full-auto assault rifle that appears in pre-alpha gameplay.
M4A1 - Appears as WeaponBase_Weapon and uses the Call of Duty: Modern Warfare 3 M4A1 model.
RX4 Storm - Cut semi-auto assault rifle that still has a menu icon within the game files.
TOZ Saritch - Cut semi-auto assault rifle that appears in pre-alpha builds. It would eventually become the SMR.
HK416C - The HK416C was supposed to be in the game, but it was cut during development. The weapon would eventually become the M27.
TAR-21 - Appears in the E3 trailer, replaced by the MTAR.
Type 95 - Appears in the E3 trailer, replaced by the Type 25.
Commando - Appears in a behind the scenes video.
Enfield - Game files remain.
G11 - Text strings remain.
AUG - Text strings remain.

Submachine Guns

Mini INSAS - Cut full-auto submachine gun that used the Uzi’s model from the first Black Ops. This weapon would eventually become the MSMC.
PM63 - Text strings remain.
MAC-11 - Strings for buying the gun remain.
Kiparis - Strings remain for buying akimbo and normal versions.
Skorpion - Game files remain.

Shotguns

NS2000 - Pump-action shotgun that shot explosive rounds.
Saiga-12 - Cut semi-auto shotgun, replaced with S12.
Stakeout - Text strings remain.

Light Machine Guns

Qbb-95 - Cut light machine gun that uses the HK21 model from the first Black Ops.
M61 Vulcan - Cut minigun that uses the same model as the Deathmachine in the first Black Ops.
RPK - Was going to be in the game, but was cut during development.
Stoner63 - Game files remain.

Sniper Rifles

DTSRS - Cut sniper rifle found in the game files.
Storm PSR - This weapon was supposed to be in the multiplayer, but it was cut in the final game.
Lynx - Cut semi-auto sniper rifle. It was referred to as the Gepard GM6 Lynx.
Desert Tactical - Cut bolt-action sniper rifle.
WA2000 - Text strings remain.

Pistols

Beretta 39r - Cut 3-round burst pistol that uses the M1911 model from the first Black Ops.
FNP-45 - Cut semi-auto pistol, replaced with Tac-45.

Launchers

Strela-3 - Vehicle lock-on only launcher.
XM25 - Cut launcher that was supposed to be in the multiplayer, but it was cut in the final game.

Map Changes

Plaza - The map Plaza was originally called "Promenade" and was completely different from the current map.

Cut Attachments

Bipod - Attachment was cut from the game.
Ammo Pack - Attachment was cut from the game.
Heartbeat Sensor - The Heartbeat Sensor was originally going to be in the game, but it was replaced by the MMS.

Cut Perks

Intruder - Most likely fused together for the Access Kit perk.
Lockbreaker - Most likely fused together for the Access Kit perk.

Cut Scorestreaks

Chopper Gunner - The chopper gunner was going to be in the game, but it was cut during development. It behaves like the Call of Duty: Modern Warfare 2 chopper gunner, appears to be the AH-64 Apache. It was replaced by the VTOL Warship.

Cut Vehicles

GAZ-63 - Files suggest it was to be put in Suffer with Me.
Pave Low - The Pave Low actually appears in the E3 Demo as a enemy helicopter, but it was cut in the final game, and it was replaced by the AH-64 Apache.

Cut Gamemodes

Resistance - Appears in game files.
Purgatory - Appears in game files.
Team Defender - Appears in game files.
Hunted - Appears in game files.

Hacker - AGRs are spread across map, teams have to capture them and attack enemies.
Datamined icon of the Hacker gamemode.

Cut Zombies Weapons

SPAS-12 - Text files remain for buying the gun.
Dragunov - Text strings remain.
Sabertooth - Cut chainsaw from Zombies.

Cut Zombies Gamemodes

Race - Appears in game files. Kill the necessary amount of zombies to open your door and progress to the end. First team to make it wins.

Meat - Appears in game files. Grab the meat and throw it. Zombies will only attack you if your side has the meat. Don't die and you might just win.
Datamined image of the Meat gamemode.

Cut Power-Ups

Zombie Head - Game files remain. It was a power up exclusive to the Grief gamemode on Mob of the Dead. It's functionality was similar to Zombie Flesh by being a throwable that would attract zombies to tagged players. The head, according to Jason Blundell, belongs to Edward Richtofen.

Cut Camouflages

Ice Blue
Mayan
Massacre - An unused camouflage with a blotchy red finish, almost resembling blood.
Tiger
Electric - An animated camouflage intended for Multiplayer.
DEV

Sources

Call of Duty: Ghosts

Cut Weapons

G18 - Text strings remain.
XM25 - Game files still remain.
MP5 - Very little remains, uses Remington R5 model in-game.
RPG - Fully usable in-game.
Stinger - Game files still remain.
USP - Fully usable in game.
P90 - Versions with multiple attachments remain. Can be seen on the mission Clockwork as the turret.
Five Seven - Game files remain.
M4A1 - Versions with multiple attachments remain.
SMAW - Fully usable in-game.
AK-47 - Versions with multiple attachments remain.

Cut Equipment

Tactical Insertion - Although it is featured in Infected, more audio clips suggest it was Create-a-Class equipment.

Cut Perks

Cut Pointstreaks

Strafe Run - Sends in a set of helicopters to fly across the map killing targets.
EMP
GPS Buddy
Cerberus Drone
Sentinel
Grenade Crate
Guardian Drone
Scout Drone
SAM Turret - Unmanned turret, designed to take down aircrafts.
Recon Marker
UGV
ODIN Battle Officer
Salvo Drone
Littlebird - A light helicopter, used for transport and/or support.
Spitfire Drone
A10
Halogen Gas

Cut Gamemodes

Cut Camouflages

Seven barbed wire camos were left in the code, all with different backgrounds.
What appears to be tiny gold pieces mashed together as a camo.
A image of gold chains, golden diamonds, and circles with the Ghost skull on it.
Apparently the Marijuana camo wasn't going to be in a DLC (Blunt Force); it was supposed to be in the original game.

Sources

https://www.youtube.com/watch?v=j56e_ruvXPc
https://www.youtube.com/user/IamJaRni/videos
denkirson.proboards.com/thread/6870/secret-ghosts-camos

Call of Duty: Advanced Warfare

Cut Weapons

FGM-148 Javelin - Rocket launcher.
SMAW - Rocket launcher.
Rhino - Pistol revolver, is known to have had multiple attachments.
RPG - Mentioned in a scrapped loading screen for Collapse.
RSASS - Gun files from Call of Duty: Modern Warfare 3 remain.
RPG-7- Was cut from the game, however, it can be found in the level "Throttle".
FAD - Gun files from Call of Duty: Modern Warfare 3 remain.
Riot Shield - The old Call of Duty: Modern Warfare 3 Riot Shield is still in the files. It can be deployed on the ground, but enemies can shoot through it.
Exo-Minigun - Infinite ammo, but has image issues.
M9 - The gun files are from Call of Duty: Modern Warfare 3, although the M9 was cut in Call of Duty: Modern Warfare 3 as well.
Throwing Knife Exo Launcher - The Throwing Knife was to be used via the Exo Launcher, and is completely usable.
MP7 - Gun files from Call of Duty: Modern Warfare 3 still remain.
M160 - A new gun, fully usable, and cut for unknown reasons.
Atlas Sword - A melee weapon intended for Exo Zombies mode.

Cut Weapon Variants

Juggernaut - A cut ASM1 variant.
Base Weapon - A variant of the SAC3 which was the same as the normal SAC3 except it was to be single-wield and was going to have a Red Dot Sight. It was going to be released with the other single-wield versions in the update which added them.^[1]

Cut Attachments

Holographic Sight - Cut from the game early in development.
Heartbeat Sensor - Uses the design from Call of Duty: Modern Warfare 3.

Cut Multiplayer Perks

Sleight of Hand - Also called Fast Reload.
Marathon- Sprint for an infinite amount of time.
Hardline Pro - Two assists count as one kill.
Stopping Power - Gives player more health.
Commando Pro - More melee length.
Saboteur - Complete objectives faster.
Double Tap - Shoot bullets faster.
Explosive Bullets - Bullets explode on impact.
Final Stand - A second chance, makes player lay on ground with little health.
Quickdraw - Aim faster.
Faster Melee - Punch/melee faster.
Personal UAV - Gives player a permanent radar.
Engineer - Earn orbital care packages and reinforcements easier.

Cut Scorestreaks

Attack Dogs - Send out dogs to attack enemies (set to be earned at 600 points).
Local Security Network Threat Detection System - Set to be earned at 600 points.
Super Suit Exo - Supposedly this scorestreak was for not only for the player, but for the whole team. It is also called Recovery in the code, which is a Multiplayer map. Set to be earned at 600 points.
Carrydrone - Cut scorestreak activator.

Cut Deathstreaks

UAV Deathstreak - Earn UAV upon death.
Juiced Deathstreak - Move faster for 7 seconds after death.

Cut Gamemodes

Kotm - Uses Free for All as gametype, but has the menu description of: "Destroy the enemy base".
Atdm- Uses Free for All as gametype.
Boot - Menu description says "Use enemy target to delay use of their exo powers".

Cut Third Person Mode

It is possible to enter third person mode in multiplayer, due to the fact that the coding for the mode is still in the game files. ^[2]

Sources

Call of Duty: Black Ops III

Last Gen Campaign

Remnants of the Black Ops 3 campaign on last gen can still be found within the files. The campaign mission Rise & Fall can still be accessed through modding, however the game runs at incredibly low frames before crashing. Campaign-specific War Machine and Annihilator Create-a-class icons still exist within the files.

Cut Weapons

Assault Rifles

M27 - Appears in game files and pre-alpha builds. It can still be accessed through console commands as base_rifle. Most likely used for testing the ICR-1.
ROBOT_GUN - Cut assault rifle It has an strange pink texture with a magazine of the KN-44, so it seems it was cut early in development.
Type 25 - Appears in pre-alpha builds.
SWAT-556 - Appears in pre-alpha builds.
FAL OSW - Appears in pre-alpha builds.
Patriot - Appears in pre-alpha builds.

Shotguns

R870 - Appears in game files. Most likely used for testing the KRM-262.

Pistols

KAP-40 - Appears in game files.

Launcher

Chaser - Cut lock-on rocket launcher.
EMP Launcher - Sound files remain. It's unknown if it was a specialist ability, or a stand alone weapon.

Special

Riot Shield - Appears in game files as lefthand_shield. It can still be loaded into the game via console commands.

Weapon Changes

KN-44 - The original names for the KN-44 was the "ARAK" in the alpha phase and the "ARK-7" in the beta phase.
Haymaker 12 - The original name for the Haymaker in the pre-alpha phase was the "FAS-X12".
Pharo - In the beta builds of the game, the Pharo had the model of the MP7 under the name weapon.smg.burst, but was remodeled. The MP7 was used for testing purposes.

Cut Attachments

Iron Sight - Attachment icon appears in game files. It uses the same icon from Call of Duty: Black Ops II.
Range Finder - Attachment icon appears in game files. It uses the same icon as the Target Finder from Call of Duty: Black Ops II.
Tac Knife - Attachment icon appears in game files. It uses the same icon from Call of Duty: Black Ops II.
Select Fire - Attachment icon appears in game files. It uses the same icon from Call of Duty: Black Ops II.
Variable Zoom - Attachment icon appears in game files. It uses the same icon from Call of Duty: Black Ops II.

Cut Equipment

Molotov Cocktail - Appears in game files.

Cut Perks

Hardline - Perk icon appears in game files. Earn scorestreaks faster.
Lightweight - Perk icon appears in game files. Move faster. Take no damage while falling.
Toughness - Perk icon appears in game files. Flinch less when shot.
Dexterity - Perk icon appears in game files. Aim faster after sprinting. Mantle and climb faster.
Marathon - Perk icon appears in game files. Sprint for a longer duration.
Datamined perk icon of Toughness.
Datamined perk icon of Marathon.

Cut Specialist Abilities

Bubble Shield - Icon appears in game files.
Boomerang - Icon appears in game files.
Cleanse - Icon appears in game files.
Pulse - Icon appears in game files.
Speedburst - Icon appears in game files.
Resurrect - Icon appears in game files.
Datamined ability icon of Bubble Shield.
Datamined ability icon of Boomerang.
Datamined ability icon of Cleanse.
Datamined ability icon of Pulse.
Datamined ability icon of Speedburst.
Datamined ability icon of Resurrect.

Cut Scorestreaks

Hunter Killer - Appears in game files.
Dragonfire - Unused icon appears in game files.
Escort Drone - Unused icon appears in game files.
War Machine - Appears in game files.
Death Machine - Appears in game files.
Warthog - Appears in game files.
Lodestar - Appears in game files.
K9 Unit - Appears in game files.
Swarm - Appears in game files.

Cut Gamemodes

Purgatory - Similar to Team Deathmatch. If a player is cornered or ambushed it will say player is in "purgatory".
Sudden Death - Appears in beta game files.
Stockpile - Appears in beta game files, replaced with Fracture.
Resistance - Appears in beta game files.
Old School - Appears in beta game files.

Cut Maps

Exile - Only a menu image remains.

Cut Zombies Outfits

Pre-alpha screenshots reveal that Black Ops 3 originally was meant to have customisable outfits unlocked by earning XP.

Cut Zombies Difficulties

During it's pre-alpha phase, Black Ops III Zombies had three difficulties, each being harder than the last.

Survivor
Hunter
Exterminator

Cut Zombies Utilities

Let It Ride Tokens - During it's pre-alpha phase, Let It Ride Tokens were an earnable currency within Zombies which could be earned by exploring Zombies maps. They were redeemable for Mega Chew Bubble Blast (an early version of GobbleGum). At some point during development, Let It Ride Tokens were replaced with Liquid Divinium.

Cut GobbleGums

Brainiac
Center of Attention
Firestarter
Melee Master
Toxic Vindicator

Cut Demonic Announcers

In the files of Revelations, both Doctor Monty and the Shadowman have lines as the Demonic Announcer. However, these files went unused for an unknown reason.^[3]

Cut Camouflages

See Me - Has the phrases "NOW U SEE ME" and "NOW U DON'T" written in alternating white, grey and black text.
Datamined image of the See Me camo.

Call of Duty: Infinite Warfare

Cut Campaign Mission

A mission with an unknown name was confirmed to be cut from the game by director Taylor Kurosaki. It was featured in the reveal trailer, showing Ethan pull Reyes onto a ship.

Cut Weapons

ACR - Appears in game files as iw7_acr.
Ameli - Appears in game files iw7_ameli.
Riot Shield - Appears in game files as iw7_riotshield.
FMG9 - Appears in game files as iw7_fmg.
ARACC - Unknown weapon, appears in game files.

Cut Equipment

Bouncing Betty - Appears in game files. Deployable projectile that launches into the air before detonating.
Siege Mode - Appears in game files. Transform into a stationary turret with strong frontal armor.
Attack Drone - Appears in game files. Sends out an attack drone. Can manually be called back, self destruct sequence can be initiated by double tap.
Portal Generator - Appears in game files. Create a physical portal that allows anyone to enter phase shift for a short time.
Barrier - Appears in game files. Fire this ability at teammates to provide them with light armor.
Mortar Mount - Appears in game files. Fire a devastating mortar off your back. Use indoors at your own risk.
Black Hat - Appears in game files. Hacks enemy equipment.
I.E.D. - Appears in game files.

Cut Perks

Passive Camo - Appears in game files. Camo systems activate when they detect enemies that are targeting you. Duration = 4 seconds.
Battery Pack - Appears in game files. Kills drop cooldown reduction packs for your team.
Scorestreak Pack - Appears in game files. Kills drop bonus scorestreak point packs for your team.
Battle Slide - Appears in game files. Gives you the ability to slide into an enemy producing a knock back effect and some damage.
Tele Slide - Appears in game files. Teleport a short distance instead of a slide.
Phase Shift - Appears in game files. Temporarily phase shift when you slide.
Ready Up - Appears in game files. Weapon is ready faster after sprinting.
Sleight of Hand - Appears in game files. Faster reloading.
Amplify - Appears in game files. Louder enemy footsteps makes them easier to detect. Allows you to hear Dead Silence players.
Augmented Melee - Appears in game files. Melee attacks are now slightly faster and close from an extended distance.
Fully Loaded - Appears in game files. Start with maximum ammo capacity.
Berserker - Appears in game files. All melee attack use fists and are lethal. Riotshield excluded.
Wiretap - Appears in game files. Utilise enemy UAVs.
SitRep - Appears in game files. Detect enemy explosives and tactical equipment.
Chain Reaction - Appears in game files. Kills with explosives set off a chain reaction that increases based on the victim's remaining equipment.
Thief - Appears in game files. Improved speed and distance on melee. Upon landing a successful melee attack, you will receive a copy of the victim's primary weapon.
Suppression - Appears in game files. Prevent boost jumping from putting you on the mini-map.
Hover - Appears in game files. While in the air after boost jumping, activate ADS to hover in place for a couple of seconds. Caution: Hover will deplete the rest of your boost meter.
Prone Mastery - Appears in game files. Improves overall movement speed while in a prone state.
Powercell - Appears in game files. Tacticlas and Lethals refresh on a cooldown.
Hunter - Appears in game files.
Phase Fall - Appears in game files. Press Crouch while in the air to quickly shift to the ground, knocking enemies directly below into phase briefly.
Headgear - Appears in game files. Provides additional protection against sniper headshots. Countered by equipping FMJ.
Disruptor Punch - Appears in game files. When using melee, an additional knockback is applied to enemies outside of melee range. Capable of knocking multiple enemies out of Phase Shift.
Wall Cloak - Appears in game files. Cloaking systems engage while in an active wallrun.
Cloaking - Appears in game files. Sprint to charge and activate cloak. Cloak then stays active for another 5 seconds, until sprinting has ceased, or lethal actions have been performed. Wallrunning and jumping will not break the Cloak.
Cloak Knife - Appears in game files. After a successful kill using melee, automatically go into Cloak.
Hamstring - Appears in game files. Greatly increase the lethality of Battle Slide.
Ground Pound Shield - Appears in game files. Deploy a temporary, destructible shield on Ground Pound.
Ground Pound Shock - Appears in game files. Release an EMP on Ground Pound.
Dodge Defense - Appears in game files. Take 50% less damage while dodging.
Extra Dodge - Appears in game files. Adds a second dodge.

Cut Payloads

Niagara - Appears in game files. Airburst grenade launcher that showers your enemies with explosives on detonate.
Siphon Wave - Appears in game files. Fires a blinding wave of force that increases armor with each target hit.
Overcharge - Appears in game files. Increased damage for non explosive weapons.
Stealth Mode - Appears in game files. Gives all stealth perks for a set time and adds a suppressor to your weapon.
Dash - Appears in game files. Quickly move in the aimed direction. Forward dashes require the user to be in the air.
Optic Wave - Appears in game files. Brief pulse that personally outlines enemies through walls.
Multi-Visor - Appears in game files. Gain multiple vision sets at once (Thermal, SitRep, and Phase-Vision). Times out after 10 seconds.
Prism - Appears in game files. Suit bends light creating a hologram decoy of the player that runs out ahead.

Cut Gamemodes

Blitz - Game files remain.
Sabotage - Game files remain.
One in the Chamber - Game files remain.
Siege - Unknown game mode, files remain.
Team Defender - Game files remain.
Mugger - Unknown game mode, files remain.
Juggernaut (and Team Juggernaut) - Unknown game mode, files remain.

Sources

Call of Duty: Modern Warfare Remastered

Cut Weapons

Galil - Appears in game files.
PP2000 - Appears in game files.
Striker - Appears in game files.
M240 - The unmounted version, appears in game files.
Tribal Staff - Appears in game files.

Cut Attachments

Heartbeat Sensor - Appears in game files.
Akimbo - Appears in game files.
Thermal Scope - Appears in game files.
Long Barrel - Appears in game files.
Tactical Knife - Appears in game files.
Extended Mags - Appears in game files.
Variable Reflex - Appears in game files.
Shotgun - Appears in game files.

Cut Camouflages

Muddy Desert Eagle - Appears in game files. Named Desert Eagle.

Sources

Original Source

https://www.reddit.com/r/CODModernWarfare/comments/5cvo7o/more_hidden_shit_mwr_shovel_weapon_more/

Call of Duty: WWII

Cut Weapons

Type 99 - Appears in game files.
Carcano M1938 - Appears in game files.

Cut Scorestreaks

Attack Dogs - Appears in beta game files.
Advanced Recon Aircraft - Appears in beta game files.

Cut Gamemodes

Sticks and Stones - Appears in game files.
Control - Appears in game files.
Lockdown - Appears in game files.
Battle Royale - Appears in game files.

Call of Duty: Black Ops 4

Cut Campaign

A co-op campaign called a Career was going to be featured in-game, but was later scrapped and replaced by Blackout. It would've followed the events of Black Ops III's campaign in a dystopian future where two factions battled over different objectives in a 2v2 scenario. Before starting your career, the player could select between siding with either the Free People's Army or World United Nations. Siding with either faction would change your campaign experience, with unique missions and scenarios being tied to each.

Cut Campaign Missions

Episode One

Data Control - "After the events of Ethiopia, travel to Zurich and sabotage a data center - one containing intel that links the black market convoy's supplier to the World United Nations."

Episode Two

Data Escape - "Stop the Free People's Army by any means necessary before they escape Zurich with intel that will globally weaken the World United Nations authority."
Snatch and Grab - "Having destroyed the data center, escape Zurich before being apprehended by the Free People's Army."

Episode Three

Air Assault Convoy - "Fighting as part of the World United Nations in Ethiopia's neutral zone, launch an air assault on a local convoy and destroy all black market contraband."

Modules

Resource Gather - Set within Spain. One team drove a four wheeler through a wide open farm area to meet with a convoy to extract resources from a base. The other team had missiles to fire at the enemy team before reaching the convoy.
Go to Ground Vehicle
Defend
Air vs Ground
Go to Noncombat
Escort Bipedal
Menu preview of Data Control.
Menu preview of Data Escape.
Menu preview of Snatch and Grab.
Menu preview of Air Assault Convoy.
Concept Art of Resource Gather.
Concept Art of Resource Gather.
Concept Art of Resource Gather.

Cut Specialist Missions

After the co-op campaign was scrapped, development on Blackout started. Raven Software started development on an entirely new campaign that reflected Black Ops 4's new direction. Despite numerous prototype missions being created, the mode was eventually scrapped and replaced by the Specialist HQ tutorial missions. Some of these cut missions ranged from entirely new experiences to onboarding missions.

Ruin Mission - Only sound files remain. During the mission, Ruin would've needed to use his Grav Slam to destroy military stockpiles of cutting-edge microchips.

Recon Mission - Only sound files remain. During the mission, Recon would've needed to track down a rogue asset who has defected to the enemy side.

Nomad Mission - Only sound files remain. During the mission, Nomad would've needed to steal critical data from three separate terminals.

Breakers - An unused specialist mission that takes place on Seaside and features Ajax. During the mission, the player is given the objective "Find the Aquilus CEO" in a counter-terrorist vs terrorist scenario. Civilians are seen running around the map and must be rescued during the mission. Unused soundtrack and voice acting is also heard throughout the mission. Interestingly enough, the civilians from this mode were later reused for the multiplayer map Masquerade.
Vengeance - An unused specialist mission that takes place in Singapore and features Seraph. Only concept art and game files remain. It appears to be based on the mission Vengeance from Call of Duty: Black Ops III.
Outback Roadhouse - An unused specialist mission that takes place in Australia and features Erin "Battery" Baker and Torque. During the mission, the player would ambush a caravan that was holding Torque hostage and then escape to a nearby gas station to hold off against waves of enemies.
Breakers In-game
Vengeance Concept Art
Vengeance In-game Concept Art.
Vengeance Concept Art
Roadhouse Concept Art
Roadhouse Concept Art
Roadhouse Concept Art
Roadhouse In-game
Roadhouse Concept Art

Cut Weapons

Assault Rifles

KN-44 - Appears in early campaign build. KN-44's can still be seen around the map Hacienda.
LV8 Basilisk - Appears in early multiplayer gameplay.
FFAR - Appears in early multiplayer gameplay.

Submachine Guns

Kuda - Appears in early campaign build.
HLX 4 - Appears in early multiplayer gameplay.

Tactical Rifles

M8A7 - Appears in early multiplayer gameplay. In pre-alpha gameplay, the Swordfish used the M8A7 icon in the killfeed.

Sniper Rifles

SVG-100 - Appears in pre-alpha images.

Drakon - Appears in the IX Trailer.

Pistols

MR6 - Appears in early multiplayer gameplay. Most likely used for testing the Strife.

Shotguns

KRM-262 - Appears in early multiplayer gameplay. Most likely used for testing the MOG 12.
205 Brecci - Appears in the Chaos Story trailer. Most likely used for testing the SG12.

Launchers

XM-53 - Appears in early campaign build. Most likely used for testing the Hellion Salvo.

Weapon Changes

VAPR-XKG - The VAPR was originally intended to have a built-in suppressor.
Auger DMR - An early screenshot from the PC behind the scenes video reveals the Auger's original name was the "TAC-MOD 700"
Koshka - Concept art reveals the weapon originally had the Sight Loader attachment. It's model can still be seen when FMJ is equip.
SG12 - Concept art reveals the weapon originally had the Quickdraw attachment.

Mag Dropping

A feature known as "Mag Dropping" was planned for the game, but was removed from the final game. When a player reloaded their weapon and still had ammo left within the magazine, the ammo would be lost instead of going back into the player's reserves. This would've changed how players approached combat engagements. Despite the feature being cut, the stylised HUD showing mag icons instead of a reserve ammo count stayed the same in Multiplayer.

Cut Attachments

Tritium Sight - Appeared in the Multiplayer beta, replaced with ELO
AP Rounds - Appeared in the Multiplayer beta, replaced with FMJ.
Uber - Underbarrel grenade launcher for the Rampart 17.
Millimeter Scanner - Mentioned in game code.
Steel Pellets - Appears in concept art for the MOG 12.
Slug Shot - Appears in concept art for the MOG 12.
Hybrid Optic - Appears in concept art as "ACOG2"

Cut Perks

Reveal - Appears in pre-alpha builds. Increased fog of war reveal radius for self and teammates.
Resistance - Appears in pre-alpha builds. Resistant to 9-Bang, Concussion, Razor Wire and Counter-UAV. Replaced by Tactical Mask.
Toughness - Perk icon appears in game files. Flinch less when shot.
Marathon - Perk icon appears in game files. Sprint for a longer duration.

Cut Gear

Thrust Pack - Appears in game files.
Datamined icon of the Thrust Pack.
Another datamined image of the Thrust Pack.

Cut Equipment and Abilities

Alarm - Appears in game files. Notifies when enemies are within proximity of the alarm.
Arm Blade - Appears in game files. Unleash a lethal melee attack with a dedicated melee weapon.
Armor Generator - Appears in game files. Restores lost and damaged armor to nearby allies.
Breach Launcher - Appears in game files. Grenade Launcher that fires sticky demolition projectiles.
C4 - Appears in pre-alpha Career gameplay and game files. It's used in a cutscene where a convoy is exploded through a C4 remote. The C4 also appears in the Spectre Rising cinematic.
Camera Spike - Only sound files remain.
Active Camo - Appears in game files.
Combat Focus - Appears in game files.
Deaf Grenade - Appears in game files. Tactical grenade that deafens those caught in its radius.
DoT Grenade - Appears in game files. Lethal Grenade that damages its targets over time.
Field Engineering Kit - Appears in game files. Engineering kit which allows for the building and destroying of barriers and cover.
Foam Grenade - Appears in game files. Foams nearby enemies on explosion.
Frag Gun - Appears in game files. Shoots fragmentation grenades which arm on impact, and detonate after a short delay.
Glitch - Appears in game files.
H.I.V.E - Appears in game files.
Heat Wave - Appears in game files.
Health Boost - Appears in game files.
Jammer - Appears in game files as "Disruptor". It was originally meant to be Zero's specialist equipment and can still be loaded into the game.
Kinetic Armor - Appears in game files.
Local Heal - Appears in game files.
Mini RAPS - Sound files and pre-alpha footage remains.
Mini Turret - Sound files still remain.
Nightingale - Appears in game files. Plays footsteps and gunfire sounds to simulate an enemy nearby.
Overdrive - Appears in game files.
Paralyze Grenade - Appears in game files.
Rejack - Appears in game files.
Shock Charge - Appears in game files.
SAM Turret - Sound files remain.
Sprint Boost - Appears in game files. Grants the user and near-by allies a speed boost, as well as unlimited sprint, for a short duration.
Pulse Grenade - Appears in game files. Tactical grenade that pulses those caught in its radius.
Swat Grenade - Appears in game files.
Satchel Charge - Appears in game files.
Team Sprint - Appears in game files. Grants unlimited sprint energy to nearby allies for a short time
Thermite - Appears in game files.

Cut Scorestreaks

Talon - Appears in game files.
Swarm - Only sound files remain.
Power Core - Only sound files remain.
RAPS - Appears in game files. An image of the RAPS can be seen on the map Arsenal.
AGR - Appears in game files. The AGR can still be seen on the map Arsenal.
Airstrike - Appears in game files.
Strafe Run - Appears in game files and pre-alpha gameplay, replaced with Thresher.
Wraith - Appears in game files and pre-alpha gameplay.
Screenshot of the Strafe Run.

Cut Specialist

Blackjack - Despite only being added within Blackout, there's still leftover files that hint at Blackjack being intended as a Multiplayer specialist. It's unknown whether or not the files below are leftovers from Call of Duty: Black Ops III.
Datamined image of Blackjack from the MP Beta.
Datamined image of Blackjack from the MP Beta.
Datamined image of Blackjack from the MP Beta.

Specialist Changes

TAK-5 - In pre-alpha gameplay, the TAK-5 is refenced as the Medical Injection Gun and functioned differently. Instead of activating the TAK-5 and healing your entire team, the user had to manually choose the allies they wanted to heal through a one-shot PDA.
The TAK-5 as seen in the multiplayer trailer.
The TAK-5 in pre-alpha gameplay.

Cut Ultimates

In early builds of Black Ops 4, all specialists had 2 abilities on a cooldown and an ultimate on a score/time system. After feedback from playtesters, Treyarch decided to scrap this system and implement scorestreaks. The ultimate would've been activated by holding down triangle and can still be seen in early builds.

Specialist	Ability 1	Ability 2	Ultimate
Ajax	9-Bang	Ballistic Shield	Strike Team
Battery	Cluster Grenade	War Machine	Artillery Strike
Crash	Assault Pack	TAK-5	Sprint Boost
Firebreak	Molotov	Reactor Core	Purifier
Nomad	Mesh Mine	H.I.V.E	K9 Unit
Outrider	Sensor Arrow	Vision Pulse	Sparrow
Prophet	Seeker Shock Mine	Tempest	Mantis
Reaper	Radar Shroud	???	Scythe
Recon	Sensor Dart	Vision Pulse	Drone Squad
Ruin	Grapple Gun	Combat Axe	Grav Slam
Seraph	Tac-Deploy	Combat Focus	Annihilator
Spectre	Smoke	???	Shadow Blade
Torque	Razor Wire	Barricade	Sentry Gun

Cut Multiplayer Modes

War - Appears in pre-alpha multiplayer gameplay. Similar to the gamemode Control, both teams have a limited pool of shared lives and must fight over different zones.
Uplink - Appears in beta game files and pre-alpha images.
Frontline - Appears in game files.
Hostage - Appears in game files.
Payload - Appears in game files.

Cut Multiplayer Maps

Urban - An earlier version of the map Arsenal. Concept art reveals the map was originally set within a futuristic facility in the middle of the ocean at night, with bright neon lights and a monorail system.

Test Map - An unused multiplayer level found within the game files.

Cut Zombies Perks

Juggernog - Appears in early zombies gameplay.
Speed Cola - Appears in early zombies gameplay.

Cut Power-Ups

Death Machine - Appears in game files with an unfinished model.
Image of the unfinished Death Machine.

Cut Zombies Modes

Treyarch Custom Mutations - The datamined description says, "TCMs are official, Treyarch-made sets of Custom Mutations created for specific Zombies maps. PLAYER and WEAPON PROGRESSION, CHALLENGES, and all OTHER REWARDS are ENABLED in this mode. New TCMs are released by Treyarch on a regular basis, but both current and previous TCMs are available for play at any time."

Cut Zombies Factions

A feature known as "Factions" was planned to release for Zombies at launch, but was delayed to Q2 of 2019 before quietly being cancelled and replaced with Contracts.
Datamined logos of the four Zombies factions.
Concept Art for Zombies factions.

Cut Cosmetic Feature

Concept art for Specialist warpaints reveal that they were originally going to include additions such as hats and horns, but the feature was never implemented.
Early versions of Specialist Warpaints.

Cut Camouflage

Singularity - Appears in pre-release footage. An early version of Dark Matter Camouflage.

Call of Duty: Modern Warfare

Cut Attachments

9mm. Magazine - There was originally going to be an ammo mod for the Ram-7 that would change the caliber from 5.56mm. to 9mm. ^[4]

Cut Features

Supply Drops - Images of Supply Drops were found within the game, and were originally intended to be part of the game. However, they were removed completely in favor of a Battle Pass.
Tattoos and Face Paint - In early screenshots seen from The Making of Call of Duty: Modern Warfare, each operator was to have a unique listing of face paint and tattoos that could be applied separately from skins.

Cut Gamemodes

Zombies - Zombies were planned for the game in early production, but never got past initial concept art.^[5]

Call of Duty: Black Ops Cold War

Cut Equipment

Razor Wire - Appears in game files and referenced in operator quotes.

Cut Field Upgrades

Barricade - Appears in game files with icons, models, animations and sound effects.

Cut Scorestreaks

Flamethrower - Mentioned within the code of the game and promotional images.
Hand Cannon - Available in the Campaign mission Desperate Measures, mentioned within the code of the game as a Scorestreak.
K9 Unit - Mentioned within the code of the game.

Cut Zombies Perks

Double Tap Root Beer - Dark Aether version of the perk jingle was found within the game's files.
Mule Kick - Dark Aether version of the perk jingle was found within the game's files.
PhD Flopper - Dark Aether version of the perk jingle was found within the game's files.

Cut Zombies Modes

Rush - Appears in pre-alpha images.
TCM - Appears in pre-alpha images.
Gauntlet - Appears in pre-alpha images.
Tutorial - Appears in pre-alpha images.

Other Sources

↑ http://assets.vg247.com/current//2015/05/SAC3-non-akimbo.jpg See the top left weapon; it has a Red Dot Sight, proving it is a single-wield version.
↑ https://www.youtube.com/watch?v=5jIXewPs8gU
↑ https://www.youtube.com/watch?v=9_xkRjniIOk
↑ https://www.youtube.com/watch?app=desktop&v=yD3JvkLsjVw
↑ https://www.instagram.com/p/CCE0enZDqKc/

[1] ttp://assets.vg247.com/current//2015/05/SAC3-non-akimbo.jpg See the top left weapon; it has a Red Dot Sight, proving it is a single-wield version.

[2] ttps://www.youtube.com/watch?v=5jIXewPs8gU

[3] ttps://www.youtube.com/watch?v=9_xkRjniIOk

[4] ttps://www.youtube.com/watch?app=desktop&v=yD3JvkLsjVw

[5] ttps://www.instagram.com/p/CCE0enZDqKc/

[1]

[2]

[3]

[4]

[5]