In the Imperial Guard Codex, we're given very little information about the Imperial Guard's Regiment, only that they amount to about 3000 men and that they're allways raised from a single world.
But that wasn't enough to quench my thirsty mind.
Per example, when we talk about the Cadian 412nd, are we talking about the 412nd regiment (of the entire Imperial Guard) that comes from Cadia, or the 412nd Regiment raised from Cadia?
Are regiments that are raised for emergencies (Eyes Of Terror and assorted wannabes) dissolved after the emergency ends? The dudes just walk back home or are they used somewhere else? When and if such regiments are dissolved, what happens to their number? Is it reused or it's a one-time deal?
And finnally, are Regiments specialised formations (infantry, armour, artillery) or combined arms formations? 3000 men just seems very little (especially considering a good part of those 3000 men will be tank crewman, gunners, officers, medical officers, etc...) for the scale of conflict the IG usually gets themselves into.
I came to see the Imperial Regiment as a self-suficient unit, like today's armies (the unit, not the institution) capable of landing on a planet, securing the beachead, whacking them pesky orks with da big gunz, smashing with the armoured fist of the emperor's wrath and securing the ground with da good ol' footsoldier. Again, 3000 men seems like a terribly small number for all that.
Hope my questions will find good answers, and thank you for the ones they find,