That sounds like the same information that was in RbS.Unfortunately I'm distantly separated from my Traveller materials, so someone else will have to help out, but IIRC where they discuss fleet deployment, they indicate that every subsector has a numbered Imperial fleet and a numbered Reserve fleet. I think it's on the same pages as the map that shows each subsector and its corresponding fleets.
That's also the same section that gives a total number of Imperial fleets, including the so-called Fast Reaction fleets at Capitol.
I'm not arguing that the intentions of the MT writers weren't to replace the subsector navies with the reserve fleets. I'm arguing that, intentions aside, both reserve fleets and duchy navies could coexist without violating either CT or MT material. (Well, actually, I was arguing that reintroducing duchy navies would be a Good Thing, but now I'll go that step further and claim that it could be done without violating MT canon (just twisting it a teeny weeny bitAs far as CT v MT, so long as MT is still canon it overrides CT where they conflict, since it has a later publication date.

I don't think they are. The regular and the reserve fleets are both part of the same navy. The fleet admiral in command of the local regular fleet would be senior to the fleet admiral commanding the local reserve fleet and the reserve fleet would be part of his command.In the OTU, as I understand it, the Imperial Navy basically has two separate, though inter-related skeletal structures. One based around front line "Imperial" fleets, and another on "Reserve" fleets.
The CT setup was:Alongside that system is a Colonial or Provisional defense force distinct from (subject to? Not sure the sources really discuss that) the Imperial Navy.
1 Imperial Navy
2 Subsector navies
3 Planetary navies
2 Subsector navies
3 Planetary navies
The MT setup was:
1 Imperial navy regular fleets
2 Imperial navy reserve fleets
3 Planetary navies
2 Imperial navy reserve fleets
3 Planetary navies
Obviously the reserve fleets were meant to replace the subsector navies, but both could be reconciled like this:
1 Imperial Navy
3 Planetary navies
1.1 Regular fleets
1.2 Reserve fleets
2 Duchy navies1.2 Reserve fleets
3 Planetary navies
Hans