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The Adeptus Astartes is comprised of autonomous [[Chapter]]s, each of which is a complete army in itself, possessing its own transport, warp-capable spacecraft, non-combatant personnel and [[fortress-monastery]] based on a planet or fleet. There are roughly a thousand Chapters, each led by a Space Marine with the rank of [[Chapter Master]]. A chapter's fighting force numbers a nominal 1,000 Marines, divided into ten companies, each of which is commanded by a [[Captain]]. Companies are further divided into squads of ten battle-brothers.⁵ This structure was deliberately established by [[Roboute Guilliman]] in the [[Codex Astartes]], and is adhered to by most chapters, but not all. Both the [[Space Wolves]] and the [[Grey Knights]] are known to maintain substantially larger forces then the Codex would permit.