Not to mention that there's a regiment in the Eisenhorn novels which numbers 750,000 soldiers. Yes, that is one regiment.
A 'regiment' in 40k is not what we think of as a 'regiment'; rather, 'regiment' appears to be a general term for all the soldiers raised from one planet in a single founding. If the planet in question is a hive world, that could easily be millions; if it's an agri-world, it might only be a few thousand.
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