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'''Terminators''' are '''[[Firstborn]]'''{{Fn|12}} [[Space Marine Veteran]]s wearing the powerful '''Tactical Dreadnought Armour''', more commonly referred to as [[Terminator Armour]]. In most [[Codex Chapter]]s , they are members of the elite [[1st Company]] of a [[Space Marine Chapter]].

Within a typical Space Marine Chapter, only the members of the [[1st Company]] have full access to the rare and extremely resilient Terminator Armour. Each suit is treated as an important relic and seen as a physical representation of the Chapter's fighting spirit.{{Fn|1}}

The most revered part of each suit of armour is the [[Crux Terminatus]], a cross-shaped badge placed on the left shoulder plate. According to legend, the Crux Terminatus worn by Terminator captains contains a shard of the armour the [[Emperor]] wore at the height of the [[Horus Heresy]]. To a Terminator, the loss of his Crux is unthinkable.{{Fn|5a}}

All suits have built -in [[teleportation]] devices which allow them to deploy anywhere via [[deep strike]], although more often they are deployed using [[Land Raider]]s. Squads consist of a [[Terminator sergeant]] and between 4 and 9 Terminators.{{Fn|5a}}

'''Terminator Squads''' fight with the standard armament of a [[storm bolter]] for ranged combat and a [[power fist]] or [[chainfist]] for close combat. The storm bolter can be swapped for an [[assault cannon]], [[heavy flamer]], or shoulder-mounted [[cyclone missile launcher]].{{Fn|5a}}

'''Terminator Assault Squads''' are oriented toward close combat. To maximise their effectiveness, they swap their standard armament for a pair of [[Lightning Claws]], or a [[thunder hammer]] and [[storm shield]].{{Fn|5f}} They often battle in close quarters, such as spaceship boarding actions or in the lower levels of a [[hive]].{{Fn|3}}

Essentially a [[Space Marine Command Squad]] equipped with Terminator Armour, a '''Terminator Command Squad''' squad consists of one terminator sergeant and three to nine terminators. The terminator sergeant is armed with a power weapon and storm bolter and the rest are armed with power fists and storm bolters. Some swap their storm bolters for [[assault cannon]]s, [[heavy flamer]]s or [[Cyclone Missile Launcher]]s and their power fists for chainfists, especially when boarding actions are carried out.{{Fn|2}}

The [[Dark Angels]]' 1st company is known as the [[Deathwing]] and is composed entirely of Terminator Squads. Unlike a traditional Codex Chapter, which distinguishes between Tactical and Assault roles, each Deathwing Terminator Squad is armed with a custom combination of heavy, close combat or ranged weaponry, depending on the squad's role on the battlefield. Membership in the Deathwing also confers access to some of the chapter's most closely guarded secrets. There are no Veteran Squads in the Deathwing.{{Fn|6}}

The [[Wolf Guard]]s of the [[Space Wolves]] are the retinue of a [[Wolf Lord]], the equivalent of a [[Codex Chapter]]'s [[Space Marine Command Squad|Command Squad]] or [[Space Marine Honour Guard Squad|Honour Guard]]. Wolf Guards have access to terminator armour, but unlike other chapters, they only wear it when the tactical situation so demands; the Space Wolves do not support a number of permanent Terminator Squads.{{Fn|7}}

Each Wolf Guard can also take command of a main Battle-Brother squad. Wolf Guard , in this case , also retain their Terminator armour.{{Fn|5b}}

Unlike any other Space Marine force, the [[Grey Knight]] chapter is unique in that nearly its entire chapter can be outfitted in Terminator armour when required. Terminators of the Grey Knights use [[Storm Bolters]] and their preference of a [[Nemesis Force Weapon]]. Some may replace their storm bolter to be equipped with [[Incinerators]], [[Psycannon]]s or [[Psilencer]]s instead. Furthermore, they also make use of psychic powers as is characteristic of their chapter.{{Fn|8}}

Two of these involved the [[Ultramarines]] [[First Company]] during the [[First Tyrannic War]] and the following [[Second Tyrannic War]]. In the first war, the entire First Company was wiped out defending [[Macragge]] and during the second a company of over twenty Terminators stormed the centre of the Tyranid invasion on [[Ichar IV]], eventually killing all of the Tyranids on the planet.{{Cite This}}