Often, Space Marine [[Space Marine Strike Force|Strike Forces]] consist of Marines from multiple different companies attached to one central Battle Company. Members from the 6th-9th Reserve Companies can provide reinforcements and extra firepower, [[Space Marine Veteran|Veterans]] from the [[1st Company]] provide skill and wisdom to augment existing forces, and [[Scouts]] and [[Vanguard Space Marines]] from the [[10th Company]] infilitrate, sabotage, and assassinate key targets. Additionally, forces can requisition vehicles from the [[Armoury]], providing armoured support.{{Cite Marker EndFn|20a}}

Attached units will typically take the heraldry of the company they are attached to. For example, an [[Intercessor Squad]] pulled from the [[7th Company]] to bolster a [[3rd Company]] force would paint their shoulder trims red in the company colour. Similarly, a [[Bladeguard Veteran Squad]] formed of [[Space Marine Veteran|Veterans]] from the [[1st Company]] attached to a [[4th Company]] [[Space Marine Strike Force|Strike Force]] would paint their shoulder trims green, rather than white.{{Cite Marker EndFn|20e}}

* [[Scout Squad]] - Trainee [[Space Marine]] unit. Scout [[Land Speeder]]s and [[Space Marine Bike|Bike]] Squads are still Scout Squads.{{Cite Marker EndFn|20d}}

Members of a squad typically bear that squad's battlefield role icon and squad number on their right pauldrons. [[Close Support Squad]]s utilise a 4-way arrow, while [[Fire Support Squad]]s display an inverted V known as a chevron, and [[Battleline Squad]]s use a simple upwards-facing arrow. [[Space Marine Command Squad|Command Squads]] bear a skull, and [[Veteran Squad (Space Marines)|Veteran Squads]] use a stylised version of the [[Crux Terminatus]] similar to a Cross Pattée. [[Space Marine Veteran|Veterans]] in [[Terminator Armour]] wear a real [[Crux Terminatus]], albeit on their left shoulder pads, displacing their Chapter Badges to their right pauldron.{{Cite Marker EndFn|20a}}

A [[Neophyte]] is the lowest rank of [[Space Marine]]. Neophytes are usually members of [[Scout Squads]], and are attached to the [[10th Company]].{{Cite Marker EndFn|20d}}

[[Brother|Battle-Brothers]] are the first rank of fully-fledged [[Space Marines]], forming the majority of a [[Chapter]]. They are divided into a wide range of squads throughout all [[Space Marine Company|Companies]] but the [[1st Company|First]]. [[Brother|Battle-Brother]] is also a term used by all [[Space Marines]] to refer to each other with.{{Cite Marker EndFn|20d}}

A [[Space Marine Veteran|Veteran]] is an elite, highly experienced Space Marine. To mark their status, Veterans wear white helmets. Veterans usually form [[Veteran Squad (Space Marines)|Veteran Squads]], but can also be members of [[Space Marine Command Squad|Command Squads]] or [[Space Marine Honour Guard Squad|Honour Guard Squads]]. Some Veterans have the ability to don [[Terminator Armour]].{{Cite Marker EndFn|20b}}

[[Ancient]]s are [[Space Marine Veteran|Veterans]] that carry a [[Space Marine Standard|Standard]]. Each [[Chapter]] has a [[Chapter Ancient]], responsible for carrying the [[Space Marine Standards#Chapter Standard|Chapter Standard]], and 10 [[Company Ancient]]s that carry [[Space Marine Standards#Company Standard|Company Standards]]. Company Ancients are usually part of the Company [[Space Marine Command Squad|Command Squad]], and Chapter Ancients part of the Chapter [[Space Marine Honour Guard Squad|Honour Guard]].{{Cite Marker EndFn|20b}}

Champions are [[Space Marine Veteran|Veterans]] that are master duellists. Each Company has a [[Company Champion]] in their [[Space Marine Command Squad|Command Squad]], while the best duellist in the [[Chapter]] is part of the [[Space Marine Honour Guard Squad|Honour Guard]].{{Cite Marker EndFn|20b}}

[[Space Marine Lieutenant|Lieutenants]] bear a red stripe bordered in white upon their helmets. A Lieutenant's right pauldron displays a skull with a red halo, similar to a [[Space Marine Command Squad|Command Squad]] icon. There are two Lieutenants per company, serving under their Captain.{{Cite Marker EndFn|20f}}

A [[Chapter Master]] is the supreme commander of a [[Chapter]]. Chapter Masters wear their own personal heraldry, combined with that of their Chapter.{{Cite Marker EndFn|20f}}

[[Chaplains]]s are [[Space Marine]]s responsible for the spiritual health of their brothers. Chaplains are just below the command level of a [[Captain]].{{Cite Marker End}} They belong to the [[Chaplaincy]] and wear black armour, regardless of Chapter.{{Fn|27e}} Traditionally, Chaplains are not allowed to be seen by their brothers without their signature skull masks.{{Cite Marker EndFn|20f}}

[[Judiciar]]s are trainee [[Chaplain]]s.{{Cite Marker EndFn|20f}}

[[Apothecaries]] are field medics, responsible for both the physical health of their brothers, but also safekeeping the Chapter's [[Gene-seed]]. Some Apothecaries, known as [[Apothecary Biologis]]es instead study enemy Xenos biology, discovering weaknesses.{{Cite Marker End}} They wear white armour, irrespective of what chapter they belong to, and wear their Chapter Badge as normal.{{Fn|27g}}

**{{Endn|20a}}: pgpgs. 16-19

**{{Endn|20x20d}}: pgs. 28-36**{{CMEEndn|20e}}: pg. 78**{{Endn|20f}}: pgs. 12-14