The Astra Militarum is a monolithic military force, soldiers and vehicles beyond number spread across war zones throughout the galaxy. Its inexhaustible armies are the Emperor's hammer and the Imperium’s shield. They defend countless worlds from invasion and rebellion, and wrest back lost territory in grand crusades. Faced with ancient monsters and extragalactic horrors, the troops and tanks of the Astra Militarum stand together, acting as one to crush any opposition with brutal and undaunted resolve.

Born soldiers, the Shock Troops of Cadia are trained for military service from the moment they can hold a rifle. Long years of rigorous firing drills have forged them into expert sharpshooters, skilled in both dogged defence and storming assault. Cadian Shock Troops are held by many as the ideal Imperial soldiers – with countless regiments mustered in their image.

Commissars are ruthless officers embedded throughout the Astra Militarum, charged with maintaining the morale, discipline, and loyalty of their regiment. With the power to summarily execute any soldier found wanting in their duties, they are feared, brooding figures. A Commissar's devotion to the Imperium is without doubt, and they fight with fanatical bravery – inspiring the same fervour in those who fall under their watchful gaze.

The ranks of the Astra Militarum feature countless regiments drawn from the planet of Cadia – or mustered in the gate world's fallen image. These born soldiers are held by many as the ideal Imperial troops – from freshly-conscripted cadets to seasoned Shock Troops and established Veterans, the regiments of Cadia fight through injury and hardship, laden with all the varied tools of war.

The Sentinel is a one-man all-terrain bipedal vehicle, used by the Astra Militarum where mobile patrols must be mounted across rough terrain, or where firepower must be deployed rapidly in response to a threat.

The Tempestus Scions are amongst the finest human warriors in the galaxy. They are fanatically dedicated to the act of following their orders - even if it may result in their own deaths - and often complete missions so dangerous that they would be deemed suicidal for a regular guardsman.

The Hydra Flak Tank is equipped to blow aerial foes out of the sky. Armed with twin-lined Hydra autocannons and a predictive logic-spirit, few airborne foes could survive the howling onslaught of the Hydra’s firepower.

The Astra Militarum is a vast fighting formation and for its operations to go smoothly a substantial command structure is needed.

The empyrically attuned minds of Primaris Psykers are steeled against the manifold dangers risked by unsanctioned wielders of the warp's power. These battle-trained psykers support the Astra Militarum's soldiers with eerie prognostication, wards against enemy witchcraft, and tempests of their own psychic might. Though rarely trusted by their peers, few generals would go to battle without a psyker's aid.

The abhumans known as Bullgryns are a formidable sight to behold. Clad in custom-made carapace armour made from the discarded tracks of a Leman Russ, they carry crude assault weaponry that capitalises on their stature and resilience.

Aegis Defence Lines are barricades comprising crenellated armoured panels that link together in a solid shield-wall. Thanks to their simple design they can be built and deployed at great speed, and are thus ideal for establishing defensive perimeters before more permanent structures can be erected.

Led by the irrepressible Colonel-Commissar Ibram Gaunt, the Tanith First and Only are a reconnaissance regiment without peer in the Astra Militarum. So named for being the only survivors of their ill-fated homeworld, the soldiers who became known as Gaunt's Ghosts are expert woodsmen marked by their distinctive camouflage cloaks, which allow them to perform feats of incredible stealth worthy of their moniker.

The Rogal Dorn Battle Tank is a lumbering behemoth, equally suited to anchoring a battle line, or grinding forward in support of an assault. Bristling with thunderous guns, these hulking armoured fighting vehicles pound breaches in enemy’s defences with enormous shells, and tear apart infantry with raucous storms of fire.

The Astra Militarum are the backbone of the Imperium's largest armies. They are the men and women who hold the line, a bulwark standing between Humanity and a nightmarish galaxy of horrors. Amongst the Astra Militarum's massed regiments, the born soldiers of Cadia are some of the most disciplined warriors to be found – tough marksmen trained for a lifetime of grim duty.

Cadian Castellans are strategic senior officers, often formally ranked as Captains or Colonels. These authoritative leaders of the Astra Militarum's forces bear a panoply of armaments and insignia that mark their high office, wielding their array of weapons as skilfully as they command the countless soldiers beneath them.

Ordnance Teams crew some of the largest human-portable weapons fielded by the Astra Militarum. From bombast field guns that lob heavy shells over buildings and intervening squads, to the barrage of warheads fired from malleus rocket launchers, or the searing energy lances unleashed by heavy lascannons, these Field Ordnance Batteries are powerful assets to any general.