Scouts: Responsible to check the district for armies and report to the commander early in season. Might also be called upon to seek individuals reported in area. The Scouts should be the most willing to spend time on a regular basis, with the commanders expected to work in bursts when needed, and the logistics called upon only occasionally as needed.
Logistics: Occasionally called on to scout, raise armies, transfer armies.
Military- Special positions can be created for special circumstances. For example, the English king may appoint two or more Wardens to lead the defense of England. The most important would be the Warden of the Northern Marches to keep an eye on the Scots. Others would be Warden of the East, West or whatever. In France, there would be two or more Marcheaux de France for the same purpose.
Individual columns of an army could also have separate commanders, for example a besieging force supported by a covering force.
And there were officials with "roving commissions," poking their noses into various things, like tax collection, the administration of justice, the condition of local castles, etc.