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The '''Codex Astartes''' is the doctrine of the [[Space Marine]] Chapters, governing all aspects of Chapter organization organisation and battlefield tactics. For any given tactical situation, the Codex has hundreds of pages devoted to how it may be met and overcome. The wisdom of thousands of Imperial warriors have contributed to the Codex, and details on everything from unit markings to launching a full-scale planetary assault are contained within its pages.

The codex was written and formalized formalised after the [[Horus Heresy]] by the [[Primarch]] of the [[Ultramarines]] [[Roboute Guilliman]]. A few Chapters, such as the Ultramarines and their successors, regard the codex as a holy text, and follow it without question. Many other chapters also follow the Codex, though not always as strictly as the Ultramarines, and all chapters that do follow the Codex are known as Codex Chapters. Among the Ultramarines, each battle brother must memorise whole sections of the codex, so that within a company there exists an entire record of the text.¹

==Organizational Organisational Doctrine==

Existing outside the Company level organizationorganisation, each chapter has an [[Armoury]] consisting of the chapter's [[Techmarine]]s and tanks, a [[Librarium]] consisting of the Chapter's [[Librarian]]s, a Chapter Fleet and the [[Chapter Master]], plus various headquarters staff and the Chapter's [[servitor]]s and [[Chapter Serf|human serfs]].

The '''1st Company''' consists of [[Veteran Squad]]s and/or [[Terminator Squad]]s. Support for the 1st company consists of [[Land Raider]]s and [[Dreadnought]]s. Only the 1st Company may use the hallowed suits of [[Terminator Armour]].

The '''2nd, 3rd, 4th and 5th Companies''' are known as Battle Companies and all have the same organizationorganisation. They are split into 6 [[Tactical Squad]]s, 2 [[Assault Squad]]s and 2 [[Devastator Squad]]s. The Assault Squads can instead be deployed as [[Space Marine Bike|Bike Squadron]]s or [[Land Speeder]]s. Battle Companies often use [[Rhino]] and [[Razorback]] transports, and commonly have Dreadnoughts.

'''===Company Colours''' - ===Each Company has a unique colour that its members wear, commonly on the shoulder plate rims, but some chapters use chest eagles, bolter cases, knee pads, helmets or other parts of a Space Marine's [[Power Armour]].

* 1st Company - : White or Silver - Members (members of the 1st Company should also paint their helmet the company colour).* 2nd Company: Yellow or Gold* 3rd Company: Red* 4th Company: Green* 5th Company: Black* 6th Company: Orange* 7th Company: Purple* 8th Company: Grey* 9th Company: Blue* 10th Company: Nominally white, however the company colour is not displayed in the members armour because they are Scouts.

3rd Company - Red 4th Company - Green 5th Company - Black 6th Company - Orange 7th Company - Purple 8th Company - Grey 9th Company - Blue 10th Company - Nominally white, however the company colour is not displayed in the members armour because they are Scouts. '''Squad Markings''' - The left shoulder plate of a Space Marine in power armour always shows the Marine's Chapter Badge. The right pad shows the squad badge, this shows the type of squad the marine belongs to and the number of his squad. [[Veteran Squad]]s use a stylized version of the [[Crux Terminatus]] similar to a Cross Pattée, Tactical Squads use an arrow, Assault Squads use four perpendicular arrows pointing outwards and Devastator Squads use an inverted V. Space Marines in Terminator Armour wear the [[Crux Terminatus]] on their left pad, and their Chapter Badge on their right pad. '''===Officers and Specialists'''===* [[Space Marine Captain|Captains]]s - Wear wear the heraldry of their company, sometimes embellished with their own personal heraldry * [[Librarian]]s - Wear wear blue armour, irrespective of what chapter they belong to, and wear their Chapter Badge as normal. (This practice is now widely ignored, even among the more standard chapters.) * [[Chaplain]]s - Wear wear black armour, irrespective of what chapter they belong to, and wear their Chapter Badge as normal. * [[Techmarine]]s - Wear wear red armour, irrespective of what chapter they belong to, and wear their Chapter Badge as normal. * [[Apothecary|Apothecaries]] - Wear wear white armour, irrespective of what chapter they belong to, and wear their Chapter Badge as normal. * [[Sergeant]]s - Wear wear the same heraldry as their squad, but carry the squad's banner, which displays the Chapter Badge and the squad's number, plus a red skull (the symbol of a sergeant). Sergeants often paint their helmets red, or in some cases wear a red skull on their helmet instead. * [[Space Marine Veteran Sergeant|Veteran Sergeants]]s - Wear wear the same heraldry as their squad, but carry the squad's banner, which displays the Chapter Badge and the squad's number, plus a red skull (the symbol of a sergeant). Veteran Sergeants often paint their helmets red and add an additional white stripe or laurel wreath. * [[Terminator]]s - Veteran : veteran battle-brothers who make use of the [[Tactical Dreadnought Armour]].