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The '''Adeptus Astartes''' (commonly known as '''Space Marines''', and colloquially as '''Angels of Death''') are the most elite and feared fighting forces of the [[Imperium of ManImperiumMan|Imperium]]. The primary unit of organization is the Chapter, a self-contained army fully equipped with its own transport, non-combatant support staff, etc. There are around a thousand Chapters, each comprising a thousand Space Marines. There are far too few Space Marines to form the Imperium's main military forces; instead they operate as highly mobile strike forces. They are entrusted with the most dangerous missions, such as lightning raids behind enemy lines, infiltration and tunnel fighting⁶. Through selection, training and conditioning, Marines are physically, mentally and spiritually superior to any other Imperial soldier.⁵[[Image:space marines deployments.jpg|thumb|right|Space Marine Deployments|250px]]