The entire population of Cadia is destined for a military life, the birth rate and recruitment rate being synonymous. The Cadian Shock Troops regiments are highly disciplined and have a reputation for being excellent shots. Indeed a child of Cadia is taughts how to strip, reassemble and shoot a Lasgun before they can read or write. Cadian regiments march to war in uniform patterns, camouflaged in a manner most suited to the mixed terrain of the Cadian wilderness. As Cadians manufacture excellent military equipment their regiments are equipped with only the finest weapons.
Cadia has a special and honoured place in the history of Mankind. It stands upon the edge of the Eye of Terror within a narrow corridor of stable space called the Cadian Gate, the only stable passage between the Chaos infested Daemon worlds of the Eye of Terror and the Imperium. No battlefleet of any size can rely upon other passages, but must pass through the Cadian Gate. Cadia is therefore one of the most strategically important planets in the galaxy.