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So does a super heavy still count as being part of a particular regiment? For example, if I want to use Armageddon order which allows a unit to board an Armageddon transport, can I use it to make my infantry board a Stormlord from a super-heavy auxillary detachment? The codex says it doesn't benefit from regimental doctrine, but doesn't say anything about it not having the regimental keyword.

Yes. With the exception of not getting the Regimental Trait, an AM unit taken in a Super-Heavy Auxillary detachment is in every way a <<Regiment>> unit.

Yes, it's still got the <REGIMENT> keyword.

If you want a regiment doctrine for your super heavy include it in a supreme command detachment. Only super heavy aux detachment is excluded from regiment doctrine.

That wasn’t the question.

Yes, OP, they retain their Keyword even if they don’t get Doctrines.