Just prior to the Clan invasion, Rasalhague's KungsArme had 32 armored regiments, yet I can't find any specific references to them. Are they covered in CM Kurita? Do we know how they were designated? During the Clan invasion, just about every armored regiment listed is associated with a planet, e.g. Fifth Alleghe Tank Regiment. Clearly these cannot all be KungsArme regiments. I assume that individual planets often maintain their own defenses, and the KungsArme is a separate federal army devoted to defending key worlds and enforcing federal authority on sometimes wayward planetary authorities. (The FRR was a new state with a particularly independent minded populace and political background.) The regiments often had high-end equipment, especially Hunter and Manticore tanks, and they were important in the Ronin War, so I would expect them to have made an impression somewhere. (As far as I can tell, the same questions apply to KungsArme's 97 infantry regiments.)
I'm guessing quite a few were on Rasalhague itself where they were ineffective due to disease, low morale, lack of concentrated force, and lack of air cover. That would still leave most of them unaccounted for. So, where were they? I feel like someone asked a similar question, but I can't find it now.
Here is one theory: There is overlap between the planet's own forces and the KungsArmy. (perhaps the 1st Alleghe Tank Regiment is also the 12th KungsArme armored regiment) But what if the KungsAmre redeploys it to another wold, or is that politically impossible? This would mean the mech forces are the only ones truly at federal disposal. Also, one would expect a huge disparity between KungsArme regiments and planetary forces, but I have not run across any evidence to support that.
Another: The armored regiments were not involved in the first 3 waves except at Rasalhague, and after the loss of the capital, they disintegrated/deserted/defected. Perhaps with the Prince on the run and the loss of their top general, they abandoned the FRR. I would think this would get mentioned in canon sources if it were the case.
Is there a canon answer? If not, does anyone have any ideas on the topic?