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'''Tiers '''in Command & Conquer refer to the '''tech level of a base and the technology''' required to produce a unit or structure. At higher tiers, more advanced and powerful units are available.

There are roughly three tiers of units:

*Tier 1: All that is required for production is the base production structure (e.g. [[Construction Yard]], [[Barracks]]). Includes light vehicles, tanks, and basic infantry.
*Tier 2: Requires an additional technology structure (e.g. [[Command Post]]). Allows more advanced units and structures to be built.
*Tier 3: Requires an expensive high-tech structure (e.g. [[Battle Lab]]). Allows for construction of very advanced units and structures, such as the [[Obelisk of Light]] and [[Mammoth Tank]]s. Occasionally further requirements may be needed, such as a construction hub for [[Epic unit]]s.

==Tiberian Dawn==
Both sides have the [[Communications Center]] as their tier 2 structure. GDI has the [[Advanced Communication Center]] as it's tier 3 structure while Nod instead has the [[Temple of Nod (Tiberian Dawn)|Temple of Nod]].

GDI can build their powerful [[Mammoth tank (Tiberian Dawn)|Mammoth tanks]] by only requiring the [[Repair facility]].

Nod can build their stealth tanks and most of their advanced units with only a communications center.

==Red Alert 1==
Both sides in Red Alert 1 are uniformed. The second tier is unlocked through the [[Radar dome]], and the third one with the [[Allied tech center (Red Alert 1)|Allied]] or [[Soviet tech center (Red Alert 1)|Soviet]] tech centers respectively.



The Allies tech center allows the allies to build thief, chrono tanks, the chronosphere, and the cruiser.

The Soviet tech center allows the Soviets to build the mammoth tanks, the flame trooper, the Missile submarine and finally the MAD tank

==Tiberian Sun==
Both GDI and Nod use [[Radar station]]s to unlock tier 2 tech and [[Tech Center (Tiberian Sun GDI)|GDI]] and [[Tech Center (Tiberian Sun Nod)|Nod]] Tech Centers for tier 3 tech. Some units also required [[Upgrade center]] or [[Temple of Nod (Tiberian Sun)|Temple of Nod]].

==Red Alert 2==
Like in Red Alert 1, all three sides are uniformed in Red Alert 2 and Yuri's Revenge. The second tier is unlocked through a radar-revealing structure: the [[Airforce Command Headquarters]] for the Allies, the [[Radar tower]] for the Soviets and the [[Psychic radar]] for [[Yuri (faction)|Yuri]].

The third tier is unlocked through one of the three Battle labs ([[Battle Lab (Red Alert 2 Allied)|Allied]], [[Battle Lab (Red Alert 2 Soviet)|Soviet]] or [[Battle Lab (Red Alert 2 Yuri)|Yuri]]).

==Generals==
There is only one tech structure per faction in Generals, unlike the usual two per faction in other Command & Conquer games.
[[People's Republic of China|China]] has the [[Propaganda Center]] for construction of advanced units and structures such as the [[Overlord tank (Generals 1)|Overlord tank]] and [[Nuclear Missile Silo (Generals)|Nuclear Missile Silo]].

The [[GLA]] uses the [[Palace]] to gain access to advanced units and structures such as [[Jarmen Kell]] and the [[Scud Storm]].

The [[United States of America (Generals)|USA]] requires a [[Strategy Center]] in order to construct advanced units and structures like the [[Tomahawk Launcher]] and [[Aurora|Aurora Bomber]].

==Tiberium Wars==
Most artillery require Tier 2 to 3 to be built.

The [[Command post]], [[Operations center]], and [[Nerve Center]] serve as the tier 2 structures of [[GDI]], [[Nod]], and [[Scrin]] respectively.


For Tier 3 [[GDI]] uses a [[GDI Tech Center (Tiberium Wars)|Tech center]] in order to build advanced units and structures such as the [[Mammoth Mk. III|Mammoth Tank]] and [[Firehawk (Tiberium Wars)|Firehawk]]. A "Tier 4" structure, the [[Space Command Uplink]], is available for GDI and provides support powers such as [[Shockwave artillery|Shockwave Artillery]].

Nod instead employs a [[Technology Lab]] to allow construction of advanced units and structures like the [[Avatar (Tiberium Wars)|Avatar Warmech]] and [[Vertigo (Tiberium Wars)|Vertigo Bomber]]. Nod also has a "Tier 4" structure, the [[Tiberium Chemical Plant]], for support powers such as [http://cnc.wikia.com/wiki/Military_applications_of_Tiberium#Third_Tiberium_War Seed Tiberium].

The Scrin use [[Technology Assembler]]s to build tier 3 units and structures like the [[Annihilator Tripod]] and [[Storm Column]]. The Scrin's [[Signal Transmitter]], a "Tier 4" structure, is unique in that it is required to build a unit (the [[Planetary Assault Carrier]]) and summon another (the [[Mothership]]), in addition to providing support powers like [[Overlord's Wrath]].

In addition, [[Epic Unit|Epic units]] cannot be built straight after a Tier 3 structure. A specialized Tier 3 Epic production structure must be built first, and only then can construction commence.

==Red Alert 3==
The three factions in Red Alert 3 each have unique mechanisms for access to advanced units and structures. Significantly, basic tanks for all factions in Red Alert 3 require Tier 2 to be built while most long range artillery need Tier 3 to built.

Allied structures are linked to the nearest [[Allied construction yard (Red Alert 3)|Construction yard]] or [[Command Hub]]. These structures are upgraded to [[Heightened Clearance]] and then to [[Max Clearance]], and the structures linked to those buildings gain the ability to produce more advanced units. If this link is lost (through the Construction yard unpacking or being destroyed, or the Command Hub being sold or destroyed), then production structures formerly linked to it will lose it, thus they can only produce basic units. In addition, the [[Defense Bureau]] provides further access to extremely advanced units and structures.

*Regular Clearance allows basic units such as [[Peacekeeper]], [[Riptide ACV]]s, and [[Vindicator]]s to be constructed.

*Heightened Clearance allows the [[Guardian Tank]], [[Cryocopter]], [[Assault Destroyer]], and [[Spy (Red Alert 3)|Spy]] to be produced.

*Max Clearance allows advanced units such as the [[Mirage tank (Red Alert 3)|Mirage Tank]] to be built.

*Defense Bureau; an advanced technology center allows structures such as the [[Spectrum Tower]] and [[Proton Collider]] to be built.
*Finally, with Clearance and Defense Bureau, the extremely advanced units classified by [http://cnc.wikia.com/wiki/FutureTech FutureTech] such as [http://cnc.wikia.com/wiki/Future_Tank_X-1 Future Tank X-1] , [http://cnc.wikia.com/wiki/Cryo_Legionaire Cryo Legionaire]  or [http://cnc.wikia.com/wiki/Harbinger_Gunship Harbinger Gunship] are provided to be built

The Empire of the Rising Sun upgrades each of their production structures individually. However, a special building, the [[Nanotech Mainframe]], is required to upgrade any structure to Tier 3. Unlike Allied tier upgrades, tier which production and key structures are independent will be lost upon destruction and each production tier is maximum, it won't affect others productions in game.

e.g. You build 2 Mecha Bays, you need to upgrade breakthrough both 2 bays if you want to build 2 King Onis at the same time. However, if 1 maximum Mecha Bay is destroyed, other Mecha Bays ARE NOT reduce tier to level 1
*Tier 1 allows basic units such as [[Imperial Warrior]]s and [[Mecha Tengu]]s to be built.
*Tier 2 allows more advanced units such as the [[Shinobi |Shinobi]] and [[Tsunami Tank]].
*Tier 3 allows for construction of advanced units and structure cores like the [[King Oni]] and the [[Psionic Decimator]].

The Soviet Union follows the traditional method of constructing certain buildings for technological advancement. A [[Super Reactor]] is required to reach Tier 2, and a [[Battle Lab (Red Alert 3)|Battle Lab]] is required to reach Tier 3. However, unlike their counterparts, if they lose all [[Super Reactor]]s and they still have at least 1 Battle Lab, they only will lose access to Tier 2 units.
*Tier 1 allows basic units and structures to be built, for example the [[Sickle]] and [[Sentry Gun (Red Alert 3)|Sentry Gun]].

*Tier 2 allows more advanced units and structures to be built, like the [[Airfield (Red Alert 3)|Airfield]], [[Tesla Coil (Red Alert 3)|Tesla Coil]], [[Akula submarine|Akula Subs]], and [[Hammer Tank]]s.

*Tier 3 allows for highly advanced units and structures to be produced, such as [[Apocalypse tank (Red Alert 3)|Apocalypse Tanks]], Kirov airships, [[Dreadnought (Red Alert 3)|Dreadnoughts]], and [[Natasha Volkova|Natasha]].

==Tiberian Twilight==
In ascension war conflict, as new Mobile Construction Vehicles (aka Crawler) are really mobile to match most present environment which is completely inhabitant (cannot build anything on the field). Most scientists have to research many access codes for unlocking newer technologies. Now you are authorized to upgrade as many as you want.

First, as Tiberian Twilight is online game and you need to harness your skill to level up. Higher level you have achieved, more technologies you can access.
*To unlock Tier 2 upgrade, your level must be 5 
*To unlock Tier 3 upgrade, your level must be 12


Both GDI and Nod have many access authorities and you must collect Tiberium Core to use as upgrade point. Tiberium Core appears on both campaign and multiplayer map and upgrade point will be come as you collect the following
*Green and Blue Tiberium Core will be provided on Tiberium Drop Zone, collecting one and return to MCV drop zone will give 1 upgrade point (2 for Blue Tiberium). Most units, however, can collect only one and it is double edged sword weapon; increase weapon damage in exchange of slow and decrease defensive power, let collector to be destroyed easier. To counter some situations, sometimes collector can choose to Detonate Tiberium Core, suicide oneself and unleash Ion Storm that harm most target including allies and your own for a short time.
*Red Tiberium Core can be found only campaign, collecting one will not need to return to drop zone but provide the most (5 upgrade points). Be careful, it is valuable but you can play with allies. Manage and share with them is the best way to solve.


Then, you need some upgrade points to unlock Tier Upgrade and the you will now access to call higher tier reinforcement.
*Tier 2 cost 5 upgrade points, 0.00 time upgrade
*Tier 3 cost 9 upgrade points, 0.00 time upgrade


As you have lost your MCV, your new one will still persist your technologies tier, even your different classes.

e.g. First you play as Offensive Class and you upgrade up to Tier 2. If your MCV is destroyed, when you call a different one like Support Class, your Support Class will still be Tier 2. Only the change is skill researches and upgrades which you must all newly upgrade.

<gallery>
GDI_Level5.png|GDI Level 5
GDI_Level12.png|GDI Level 12
Nod_Level5.png|Nod Level 5
Nod Level12.png|Nod Level 12
Button_UpgradeGDITechTier2.png|Tier 2
Button_UpgradeGDITechTier3.png|Tier 3
</gallery>

==Strategy==
Since tech structures are usually expensive, time-consuming to construct, and poorly-armored, they are a high priority target. Destruction of a tech structure is easy, and can interrupt production of advanced and powerful units or progress to the next Tier, with significant amounts of time and resources required to rebuild the tech structure.
[[Category:Concepts]]
[[Category:Gameplay Concept]]

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