The power armour history charts are pretty straightforward for DW SM standard power armour. It's from your chapter and has acquired quirks over time and you have to live with it. The artificer armour is a suit unique to its' wearer and has a powerful machine spirit, hence two rolls which the character keeps. All well and good.

Now Terminator armour. p164 clearly states you roll once on the power armour history table. No problem there, terminator armour gets quirks like the others.

But what happens during requisition? Unless a DW SM takes a suit as signature wargear, they are unlikely to have permanent access to Terminator armour. So I see a grey area with a few possible outcomes.

1. Does the power armour history have to be rolled each time a SM requisitions Terminator armour?

2. Is the power armour history rolled once per SM and they have to take that suit from then on?

3. Can a SM pick and choose between suits (or at least have them chosen by their Watch Captain) based on their aptitudes?

I've a notion for a future campaign to randomly select how many suits of Terminator armour are available at a given time in Watch Fortress Erioch and their quirks (D10s don't take that long to roll) and have players choose from that pool.

Any other thoughts?

I would go with: Roll once, and that's the armor that you are assigned, and you will always be given that same suit.

By the time you are able to requisition Terminator armor(TDA), you are probably one of the most senior DW marines at your particular watch station. Having marines assigned to particular suits of TDA would not be out of the question, since few should, or would, have the status needed to be granted the honor of wearing it.

It could be that a particular suit is already set to be within your size tolerances and the Techs prefer to make minimal adjustments to the armor, so as not to disturb the machine spirits, or just ease of bookkeeping for players and GM. That said, the idea of changing it up isn't terrible.