Originally posted by BenBell:
Okay. I'm having a few problems reconciling some of the ranks here. It seems from my research that there is a Grand Admiral that covers a sector, and not a domain as I originally thought.
So the Grand Admiral covers the sector and immediately under him are two Sector Admirals who control the regular and reserve fleets of the sector.
Why? Why have a Grand Admiral who just oversees these two Sector Admirals? Why not have the Grand Admiral be in charge of the Domain Fleets instead. It would make more sense since a great many things are arranged on the Domain level the Archduke would then only have to consult one person on the state of it's navy instead of 4 Grand Admirals if they only covered a sector.
You may yet be correct, for in RL in the US Navy we've got Admirals (full admirals, highest current rank) running theaters (Pacific, Atlantic, etc.), holding the higher posts of naval administration (Chief of Naval Operations, Chief of Naval Personnel, etc.) AND holding the position of Navy Chief of Staff on the Joint Chiefs. This latter may well head the Joint Chiefs of Staff, and report directly to the President and the Secretary of Defense.
In the Traveller Universe you could say that Grand Admirals would be in charge of each Sector, and have one of them acting as Domain Grand Admiral, or have someone entirely different hold that post. In similar fashion, these Domain Grand Admirals would report to both the Archduke and to a still higher Grand Admiral who serves much the same function as our Navy Chief of Staff on the Joint Chiefs. The Marines, Army and Scouts would undoubtedly have similar representation, and this Joint Chiefs would report to both the Emperor and to a Ministry of War (or Defense, or Really Determined Passive-Aggressiveness, or whatever it may be).
As for why have a Grand Admiral running herd on two Sector Admirals, that's farly straightforward. Each Sector Admiral would be trying his/her/its hardest to ensure that his/her/its (just "his" from now on) command received the best and fullest measure of any spare ships, equipment, personnel, budget, etc., that was available, certain that this would be best for the welfare of the Imperium (not to mention his own position). The Main Fleet admiral would rationalize this by saying that his fleet is going to be the first to take the brunt of any action, so they've got to be at their best, while the Reserve Fleet admiral will then point out that the Main Fleet is only there to buy time for the Reserve Fleet to be called up, and the more men and materials the reserves have, the better and quicker prepared they'll be to really hammer the enemy. The Grand Admiral is the one responsible for balancing the needs of both of these fleets, in addition to all the other naval concerns in his area of responsibility (such as shipbuilding, Depot maintenance and expansion, research and development, etc.) . In like fashion, the Domain Grand Admiral has to balance the needs of all the Sector Grand Admirals, for almost exactly the same reasons.
Also, don't forget the probably overwhelming power of the reason, "Tradition." With the Vilani influence on the Imperium, the old cliche, "This was the way it was done when I entered the Navy, this was the way it was done when my father entered the Navy, and his father before him, and his father before him, and..." will take on an entirely new level of meaning. When the Third Imperium was just limited to Core Sector, the highest ranking officer in the navy was the Grand Admiral in charge of all the fleets (which at that time were probably limited to one Sector Fleet and one Reserve Fleet from lack of numbers alone.) As the Imperium expanded, it just never occurred to anyone to change the ranking system. "It's worked okay so far. Why mess with it?"
Just adding my 2 centicreds,
Simon Jester