Board Thread:Warhammer 40k General Discussion/@comment-66.187.233.202-20160311162536/@comment-28917471-20160311170709

First off, not every Ordo has a Chamber Militant. And just because the two major Ordos have a Chamber Militant that has the Deathwatch and the Grey Knights, does not mean that Ordo Hereticus must have it own Chamber Militant of Space Marines.

Also, it should be noted that Ordo Hereticus was born in the 36th Millennium, unlike the Ordo Malleus and Ordo Xenos that was born in 31st Millennium. The new Ordo has acknowledged the execution that the Brides of the Emperor (their previous name) have carried out, and sealed a pact with the Sisters to be their fighting force.

Yes, the Ecclesiarchy and the Ordo Hereticus are two different organisations.

Hope that everything above answers your question.