The Ordo Tempestus, also known as the Militarum Tempestus, is amongst the most rigidly codified of all Imperial organisations, for its men form the backbone of the Astra Militarum. Though the Ordo is technically a sub-faction governed by the Adeptus Administratum, it enjoys a far greater amount of autonomy than the regiments that often fight alongside it. The Ordo's ranks are primarily comprised of Commissars and Tempestus Scions, though they have often included specialist factions mysteriously absent from Imperial records. In every theatre of war across the galaxy, the Ordo's men work alongside the incalculable might of the Astra Militarum, their elite training complementing the sheer manpower of the Imperial Guard.