Editing Active camouflage

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<center>''Are you looking for the Halo 4 [[Type-3 active camouflage|version]]?. For other uses, see [[Camouflage (disambiguation)]].''</center>
[[File:Hidden Dragon.jpg|thumb|250px|A [[Spartan-II|Spartan]] using active camouflage.]]
{{quote|One of those [[Sangheili|things]] is inside, and it is ''invisible''!|Cadet [[Thomas Lasky]]<ref>'''[[Halo 4: Forward Unto Dawn]]''', ''Part 4''</ref>}}
'''Active camouflage''' (often shortened to '''active camo''' or '''av-cam''') is a form of technological [[camouflage]] designed to conceal an object from visual detection by rapidly adapting to its surroundings. Both the [[United Nations Space Command|UNSC]]<ref name="goo">'''[[Halo: Ghosts of Onyx]]''', ''page 291''</ref> and the [[Covenant]] use various forms of active camouflage technology, though the term is most prominently applied to Covenant-developed cloaking equipment.

Technically, active camouflage is not quite invisibility, though it is very similar. Rather, the term is used to describe a broad range of technologies that allows a wearer or object to blend in with its terrain, mimicking the environment around it perfectly, though in two dimensions. There are a variety of ways to do this, though the UNSC uses [[photoreactive panel]]s on its [[Semi-Powered Infiltration armor]] and [[prowler]] stealth ships for optical camouflage, adapting to the object's background to account for movement.

Though it has never been elaborated on in detail, it is suspected that Covenant versions of the concept use [[Wikipedia:Phased array optics|phased array optics]] to project a three-dimensional [[holography|hologram]] of background scenery around the wearer of the system, effectively ''bending'' light, a task well within the Covenant's [[Technological Achievement Tiers|tier two technology level]]. The technology can be utilized on human armor systems, such as the [[MJOLNIR Powered Assault Armor|MJOLNIR armor]], but the UNSC has only developed rough equivalents.<ref>'''[[Halo: The Fall of Reach]]'''</ref>

==Covenant active camouflage==
Covenant active camouflage technology uses a field of energy to bend light around the user, thus making them effectively invisible. The armor used by [[Special Operations Sangheili|Spec-Ops]] and [[Stealth Sangheili]], as well as that of [[Arbiter]]s, [[Jiralhanae Stalker]]s and even certain [[Sangheili Zealot]]s<ref>'''Halo: Reach''', campaign level ''[[Tip of the Spear]]''</ref>, include built-in active camouflage generators. These built-in generators have a severe drawback in that they divert power from shielding equipment. Troops equipped with permanent active camouflage generators tend to have weaker shielding than those not equipped with an active camouflage generator.

Arbiter [[Ripa 'Moramee]] was equipped with an active camouflage generator capable of generating a near-perfect cloaking field indefinitely, but had no energy shield generator and was forced to rely entirely on the protection of his armor plates. Arbiter [[Thel 'Vadam]] was also equipped with an active camouflage generator, but the device was capable only of providing a cloak for a few seconds, and although 'Vadam was equipped with personal shielding, his shields were relatively weak for an individual of such high rank, equivalent to those of a [[Sangheili Minor]]. 

Aircraft or ships can also be equipped with active camouflage systems, including the [[Type-52 Phantom]] that has its own active camouflage generators on board for various stealth missions.<ref>'''Halo 3''', campaign level ''[[The Covenant (level)|The Covenant]]''</ref> Larger vessels such as [[Covenant supercarrier|supercarriers]], or entire armies, can be effectively hidden from both plain sight and sensors by using external stealth systems such as [[stealth pylon]]s.<ref>'''Halo: Reach''', campaign level ''[[Tip of the Spear]]''</ref>

For personnel not equipped with built-in active camouflage, it can be provided by a variety of devices. Typically, the energy used to provide the effect is suspended inside a small, transparent pyramidal container, or a larger spherical force-field. Personnel can use the light-bending energy by coming into physical contact with the container or force-field, which will cause it to break and release its contents. Upon release, the energy envelops the wearer and bends light around their skin; armor or [[energy shielding]], conforming to their form and rendering them almost invisible. After a short period of time, the energy will gradually dissipate and wear off, slowly revealing its user. The active camouflage provided by these devices lasts for ten seconds, and only prevents visual detection; those using active camouflage can be observed by other means, including motion tracking, noise, and environmental disturbances such as footprints on soft terrain.

===Function===
Covenant active camouflage will easily cloak its user, but its effect does not completely extend to items in the user's possession; [[human]] [[weapons]] are easily cloaked by active camouflage, but Covenant weapons are visible even with active camo, as the light-bending energy cannot mask the glow of the weapons' plasma. In ''Halo: Combat Evolved'', however, plasma glow is hidden quite well by the cloaking equipment.

Though active camouflage is quite effective from a distance, it can faintly be seen if an observer is close enough to the wearer. However, it is difficult to spot a camouflaged opponent from a distance using a scoped weapon -- actual physical proximity is required to reliably spot a person using active camo. It should be noted, though, that active camouflage does not mask environmental effects such as footprints, meaning that it is not as effective on soft terrain such as snow.

The shielding provided by Covenant active camo can be disrupted if projectiles pass through it; such a disruption weakens the invisibility effect and temporarily reveals the wearer. The powerup can be disrupted if the wearer fires shots or if the wearer is hit. It also progressively worsens: the longer the wearer fires (or is hit), the more visible they become. Once the disruptions end, however, the wearer quickly regains their invisibility.

Talc powder and other atmospheric particles can disrupt the systems, causing the technology to overload and fail.<ref name="firststrike">'''[[Halo: First Strike]]'''</ref> The device also generates a considerable amount of heat, causing its user to be clearly visible on human thermal goggles and some variations of the [[SRS99C-S2 AM sniper rifle]].<ref>'''[[Halo: The Flood]]'''</ref> The humans of [[Alpha Base (Installation 04)|Alpha Base]] on [[Installation 04]] used this advantage when their base was infiltrated by stealth Elites, equipping their [[Fireteam]]s with infrared goggles allowing them to easily see the attackers. In addition, [[SPARTAN-II program|SPARTAN-IIs]] [[Will-043]] and [[Kelly-087]] employed talc powder in order to overload the camouflage on [[Reach]] in order to find them.<ref name="firststrike"/>

==UNSC active camouflage==
The UNSC has developed several varieties of active-camouflage technology. These do not utilize the same light-bending energy as Covenant active camouflage and are generally less effective. The most common form of human active camouflage technology operates on a different principle than the Covenant counterpart, using [[photoreactive panel]]s to impersonate the surrounding environment like a chameleon. A device known as the [[camouflage cloak]] can hide the wearer's infrared signature, beside serving as a form of camouflage.<ref name="goo"/>

The [[Semi-Powered Infiltration Armor]] used by the [[SPARTAN-III program|Spartan-IIIs]] utilizes photo-reactive panels to conceal the wearer's infrared signature and to blend in with the surrounding environment. When combined with their natural talent and training for stealth, it can be a very effective tool. Some [[Headhunters]] used a prototype camouflage almost identical to the Covenant version, rendering them almost invisible, except that it only lasted 3-5 minutes and other systems have their power drained while it recharged. This feature saw very limited use in field tests by [[Orbital Drop Shock Trooper|ODSTs]].<ref>'''[[Halo: Evolutions - Essential Tales of the Halo Universe]]''', ''[[Headhunters]]''</ref>

A common human active camouflage device, copied from similar Covenant technology, comes in the form of a "plug" which attaches to a socket located on the lower back of compatible armor. The non-integral nature of the device allows it to be added or removed at will for improved operational flexibility. The device provides a conditionally effective cloak; as long as the user remains still or moves slowly, the camouflage will be highly efficient, providing near-total invisibility for minimal energy loss. However, if the user moves more quickly, the camouflage will only provide rudimentary coverage and drain its energy very rapidly. Firing a weapon will also disrupt the camouflage and reveal the user. Furthermore, external sounds will be highly muffled to the user while this camouflage is in use, and if the user is equipped with motion tracking equipment, the detection capability of the motion tracker will be severely compromised, jamming the display with "ghost" targets.<ref>'''[[Halo: Reach]]'''</ref>

Much like the SPI armor, UNSC Prowlers use [[texture buffer]]s or "active camouflage skin" in conjunction with [[stealth ablative coating]]s to conceal themselves from view in addition to masking their heat and radar signatures.<ref name="goo"/> This camouflage isn't perfect however, and cannot keep up with a constantly changing background such as a gas giant's atmosphere.<ref>'''Halo: Evolutions - Essential Tales of the Halo Universe''', "The Impossible Life and the Possible Death of Preston J. Cole", ''page 477''</ref> However, more advanced stealth ships were developed, such as [[ONI PRO-49776]] using a form of cloak "bubble" similar to the light-bending energy fields used by the Covenant. This technology has not been observed in widespread use.<ref>'''[[Halo Legends]]''', ''[[The Package]]''</ref>

The [[MJOLNIR Powered Assault Armor (GEN2)|MJOLNIR Powered Assault Armor [GEN2]]] system incorporates T-3 Refraction Dissonance Modifier/Camouflage modules for stealth, working much the same as previous technology with the bending of light and patter realignment.<ref name="Waypoint">[http://www.halowaypoint.com/en-US/Halo4Guide '''Halo Waypoint:''' ''Halo 4 Interactive Guide'']</ref>

==Changes throughout ''Halo''==
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If the active camo is active during [[Campaign]], the player is completely invisible to the AI enemies unless they fire their weapon. Active camouflage is only usable in Campaign when playing as the [[Thel 'Vadam|Arbiter]] in ''[[Halo 2]]'', or if the player obtains the [[Halo 2 Skulls#Envy|Envy Skull]] and restarts Campaign (active camo replaces Master Chief's flashlight). In ''[[Halo 3]]'', rather than Active Camouflage, the slightly different [[Cloaking]] is available. It is also available as a powerup in five levels during ''[[Halo: Combat Evolved]]'': [[Truth and Reconciliation]], [[Silent Cartographer]], [[343 Guilty Spark (level)|343 Guilty Spark]], [[Keyes]], and [[Assault on the Control Room]].

An interesting fact about Active Camouflage is that although the player can see the [[Type-1 energy sword]]-wielding Active Camo Elites in ''Halo: Combat Evolved'' (due to the sword), the [[UNSC Marine Corps|Marines]] cannot see them; this is likely because the developers did not realize that the energy sword showed through the Active Camo, leading them to code the Marines' AI to be oblivious to it. This advantage is removed in ''Halo 2'' -- the Elites now wait, only activating their swords when they're about to kill the player.

===Halo 2===
In ''Halo 2'', it is noted that the Arbiter's armor, while possessing a built-in active camouflage generator, is not permanent, unlike the more modern generators used by Special Operations Elites. There is a circle on the player's HUD that shows the amount of time left for both the usage of the active camouflage and the recharging sequence. The Master Chief can gain this ability with the Envy Skull on Legendary only; however, his screen will lack the meter, forcing you to remember the time allowed for use.

When playing as the Arbiter, using any attack will cause the active camouflage to deactivate, and the player must wait for it to recharge before using it again.<ref>'''[[Halo 2]]'''</ref>

===Halo 3===
{{Main|Cloaking}}
In ''Halo 3'', the Active Camo is no longer contained inside a pyramid construct. Instead it appears as a large, glowing sphere with what appears to be containment devices around it, enclosing the powerup in ''[[Halo 3]]'' [[multiplayer]]; but unlike past Halo games, active camo is ''not'' found in campaign. In campaign, Active Camouflage is replaced by the [[Cloaking]] [[equipment]], which functions in the same way as active camouflage once did. Melee attacks, shooting, throwing grenades and using equipment will negate the effect of the power-up. Also, wearing the [[Armor Permutations (Halo 3)#Spartan Armor Permutations|Flaming Helmet]] is an obvious give-away to the opponent because the fire is still visible. 
By default, the pick-up lasts 30 seconds and doesn't dissipate with movement, unlike in Reach.

The quality of camouflage in custom games may be set to two different settings:<ref>[http://www.gametrailers.com/player/20131.html '''Game Trailers''': ''Custom Games Glitch Gameplay'']</ref>
*'''Poor Camo''': The player has camouflage that might fool a [[Unggoy|Grunt]].
**The player is still somewhat visible.
*'''Good Camo''': The player has camouflage that will fool an attentive [[Sangheili|Elite]].
**This makes the player almost invisible, but the light is distorted within the player's shape.

===Halo: Reach===
The Active Camo in ''[[Halo: Reach]]'' has undergone many major changes. It is now available as an [[Armor abilities|Armor Ability]] to both Spartan and Elite players. As a secondary effect, when used, it acts as a Radar Jammer, scrambling the radar of the user and all enemies within 25 meters, making the user harder for enemies to detect on their motion trackers. This function can be both beneficial and detrimental to the player; on the one hand, it can make enemies easier to ambush, however, it also informs the enemy team that someone is using Camo nearby. This can backfire on the player by making the enemy team more perceptive to possible ambushes. The Active Camo also greatly reduces the volume of all sounds for its user, making it more difficult to notice a grenade being thrown or a nearby enemy firing a weapon.

The strength or effectiveness of the Camo also varies depending on whether/how fast the user is moving. When standing still, the player is rendered almost completely invisible. Moving slowly or crouch-walking will slightly decrease the quality of cloaking, although the user is still hard to spot. When moving faster than crouch-walking speed, the Active Camo becomes much less effective, cloaking the user only partially (similar to the Poor Camo from Halo 3). The player's movement speed does not affect the rate at which the Armor Ability meter drains. 
The freedom for the player to control when they activate their camouflage makes it much more effective, as it allows for use in the most opportune situations, instead of restricting the player to activate it on pickup. However, the reduced hearing and radar jamming effects require the player to be more aware of his surroundings than usual. <ref>[http://www.bungie.net/News/content.aspx?type=topnews&cid=26366 '''Bungie.net''': ''Halo: Reach Beta Survival Guide '']</ref>

===Halo: Combat Evolved Anniversary===
Active camouflage now makes the user extremely hard to spot due to the enhanced graphics. Distortion also covers more the exact shape of the user, unlike previous iterations.

===Halo 4===
The '''[[Type-3 active camouflage|Type-3 Refraction Dissonance Modifier/Camouflage]]''' bends light around a structure, hiding it via advanced pattern realignment. It is similar to the version in Halo: Reach, however the jammer no longer makes false hostile contacts appear on the motion sensor, rather it makes neutral contacts appear and in a much tighter grouping than before, therefore not only preventing the user from using it to trick enemies, but possibly giving away their location. Despite this, it still is an effective tool for hiding outside of cover and ambushing enemies.

==Trivia==
*Changing the graphics card settings on [[Halo PC]] (lowering the quality and effects) makes active camouflage users appear as an easily-seen gray, opaque silhouette.
*Oddly enough, a group of Major and Minor Grunts in the ''Halo 2'' level [[Delta Halo (level)|Delta Halo]] used Active Camouflage as they fought alongside a group of [[Stealth Sangheili|Stealth Elites]]. Spec Ops Grunts are also seen using this in the level [[The Arbiter]] just before entering the gas mine. This suggests that at least some Grunts have this equipment.
*When used in association with an [[Overshield]], the Active Camo becomes completely useless due to the charges of the overshield washing over the player's body (except in ''Halo: Combat Evolved''). In ''[[Halo 3]]'', the same effect occurs when Active Camouflage and Overshields are both working.
*The active camouflage has no effect on the flames on the [[Bungie Armor]], allowing enemies to more easily locate the user of the chest piece.
*With the [[Halo 2 Skulls#Envy|Envy]] skull on in ''[[Halo 2]]'', the [[John-117|Master Chief]]'s flashlight will be replaced with active camouflage. This can also be combined with a glitch which allows you to reload from a checkpoint, after saving and quitting, and turning off your console, with infinite active camouflage. This makes the Campaign on ''Halo 2'' considerably easier, even on Legendary difficulty.
*In any Halo game, when you have active camouflage on and you get in a vehicle, the camouflage stays on and appears as if there was a ghost driving it or that it was driving itself (works particularly well with the Warthog LAAG). It works with any vehicle which exposes the occupants to view.
*In ''Halo 2'' for Windows Vista, when playing on Threshold, your comrades are not picked up by radar when camouflaged.
*The lights on a [[Type-2 gravity hammer]] can be seen clearly when camouflaged. It is not recommended to have a Gravity Hammer either as your primary weapon or secondary weapon when using active camo, as the lights make you an easy target for experienced snipers.
*In ''Halo 3'', go in Monitor mode and find an Active Camouflage. Go inside it. After about 10-20 seconds, the Active Camo will stop making its shimmering noise and you'll hear a brief whispering sound (like a sigh or breath), and then it will continue its shimmering noise.
*Strangely, the active camo module in the ''Halo: Reach'' [[Halo: Reach Multiplayer Beta|Beta]] had "UNSC" printed on it, even when being used by Elites, though this is likely because it was a placeholder file.

==Gallery==
<gallery>
File:AC flame head.jpg|Bungie Armor and Active Camouflage in ''Halo 3''.
File:HaloCE-ActiveCamouflage.jpg|A Stealth Elite]] using active camouflage.
File:AC.png|Active Camo in ''Halo: Combat Evolved'' multiplayer.
File:H2 Active Camouflage.png|The Active Camouflage in ''Halo 2''.
File:ActiveCamo.jpg|The Active Camouflage in ''Halo 3''.
File:HReach Active Camouflage.jpg|The Active Camouflage powerup in ''Halo: Reach''.
File:HaloPCActiveCamoflage.png|The Active Camouflage effect in Halo PC.
File:H4 AvCam.jpg|Active Camouflage in use in ''[[Halo 4]]''.
</gallery>

==List of appearances==
*''[[Halo: The Fall of Reach]]'' {{1st}}
*''[[Halo: Combat Evolved]]''
*''[[Halo: The Flood]]''
*''[[Halo: First Strike]]''
*''[[Halo 2]]''
*''[[Halo: Ghosts of Onyx]]''
*''[[Halo 3]]''
*''[[Halo Wars]]''
*''[[Halo 3: ODST]]''
*''[[Halo Legends]]''
**''[[The Package]]''
*''[[Halo Evolutions - Essential Tales of the Halo Universe]]''
**''[[Headhunters (short story)|Headhunters]]''
**''[[The Impossible Life and the Possible Death of Preston J. Cole]]''
*''[[Halo: Reach]]''
*''[[Halo: Combat Evolved Anniversary]]''
*''[[Halo 4: Forward Unto Dawn]]''
*''[[Halo 4]]''
**''[[Spartan Ops]]''
*''[[Halo: Spartan Assault]]''
*''[[Halo 2 Anniversary]]''

==Sources==
<references/>

==Related pages==
*[[Overshield]]
*[[Permanent Invisibility]]
*[[Custom Powerup]]
{{Armor abilities}}

[[Category:Camouflage]]
[[Category:Armor abilities]]