I have an idea regarding the Vice-marshal, but since I probably want to do it IC for one of my characters...I hesitate to say it.
But whatever, it might lead to some more involved vice-marshals hopefully.
As Vice-Marshal, be proactive. Volunteer to do the army reports, you know, where you go around and collect unit status data from all your members. Let the marshal focus on tactics and organization, while vice-marshal focuses on making sure those orders are received and followed.