A Space Marine Chapter that generally follows the guidelines of the Codex Astartes is referred to as a ' Codex-compliant Chapter.' While not all Space Marine Chapters in the Imperium adhere to the Codex's dictates with the same rigidity as the Ultramarines, most obey the spirit of the Codex if not the actual letter. Its primary purpose was to restructure the Imperium of Man's most potent military forces to prevent another civil war like the Horus Heresy. It outlines Guilliman's ideal for the moral behaviour, order of battle and tactical doctrine of a Space Marine Chapter. The Codex Astartes is a great and sacred tome of military organisation, strategy and tactics written by Roboute Guilliman, the primarch of the Ultramarines Space Marine Legion. Marneus Calgar, Chapter Master of the UltramarinesĪ diagram displaying the organisation and structure of a Codex Astartes-compliant Space Marine Chapter before the revision of the Codex and the introduction of the Primaris Space Marines in the Era Indomitus.

As it is written in the Codex, so shall it be.' ' We follow in the footsteps of Guilliman.

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