Over the five years following Demeter, the MCOR, along with the Militia as a whole, has been formed from rag-tag militia to a proper army with logistics, industrial centres and organisation. The MCOR now has its own sub-groups such as the 41st Militia Rifle Battalion but has been restucured in the Militia command to answer to the newly-formed Special Recon Squadron.
↑Reddit Q&A: "Part of the evolution of the Militia at this juncture resulted in restructuring of the paramilitary apparatus. Marauder Corps was restructured as one of several sub-units (Corps) within the newly formed SRS (Special Recon Squadron). SRS represents an elite branch that exists parallel to the other major branches of the new Militia structure, alongside the equivalent concepts of say, what one might call the Army, Navy, etc."