ok, Ive been thinking a lot about how the Imperiums Military forces are structured but Im unsure on a few points:

The departmento munitorum is noted as having a High command organisation, where do these generals etc come from? are they promoted from the IG or recruited from the nobility?

Does the depatmento munitorum also conrol the Navy? I know the IG arent allowed control over ships but there must be someone to co ordinate ships and troops, to make sure that the imperial guard regiments end up where they are needed and relativly on time.

Any ideas are greatly appreciated.