A Chapter is a self-contained Space Marine army usually made up of a thousand or so Space Marines, as well as a large number of administrative and functionary personnel. The Adeptus Astartes is divided into roughly a thousand Chapters, but each constituent Chapter is autonomous and constitutes a complete army, with its own leadership, support and administrative staff, reliant only on its own chapter members. Unlike the Imperial Guard, the Adeptus Astartes has no leadership above the Masters of the individual Chapters. Also unlike many other Imperial military forces, the Astartes has no members which represent the organization as a High Lord of Terra.