The Duchess of Sabine, Silvan Diisarirga has many responsibilities. The 1195th Colonial Fleet, which is one of the numbered colonial fleets of the Deneb Sector, is her responsibility. She is also responsible for the administration of the Unified Army of Sabine.
The Magash System Defense Force is also under her nominal command. Unlike most system defense fleets Magash's includes a number of jump capable fast couriers and mercenary cruisers. Some of these forces are under the command of local rivals from other settlements on Magash or in-system. All have pledged to assist the Duchess in defending the system, but though the loyalty of these forces to the Imperium is unquestionable, the reliability of some of these groups to the Duchess is less certain.
The System Defense Force is divided into four departments, each commanded by an officer of flag rank. The Planetary Defense Force, Fleet Auxiliaries, Close Orbit And Aerospace Control Command (COACC) and the System Defense Fleet.
The PDF mission is primarily defensive. Since the end of the FFW a number of
deep meson sites have been installed by the PDF. Combined with defensive laser
and missile batteries these form the balance of the PDF forces. These meson
sites are held by several of the planetary governments and act as much as deterrents
against other local forces as to invaders. Besides the 5233rd Profor Infantry
there are three other Imperial grade colonial regiments on Magash, all maintained
by the other Imperial Nobles resident there. The Menashiriikuu
Magash's COACC forces consist mostly of suborbital interceptors. COACC is also responsible for the sensor systems and networking equipment that allows System Defense to tie together the deep meson sites, missiles and laser sites belonging to PDF, and the SDB of the Fleet into a single defensive force. Trust between the various local forces is not high, and the effectiveness of the joint communication network is untested.
Also in the fleet are the Broadswords and Kalashnikov Mercenary Cruisers of Magash Maximus Corporation, which are considered auxiliary vessels. The Magash governments also each possess several jump capable fast couriers, which are counted among the fleet auxiliaries, as well as a few private yachts which could be pressed into service in great need.
The Huscarle of House Diisarirga consists of three regiments. The first regiment is the 5233rd Profor Infantry Regiment, the Duchess's Own Magash Dragoons. This force has served in both the Fourth and Fifth Frontier Wars. It is part of the Imperial Magash Army normally in service with the Unified Armies of the Imperium and is often off world on the Emperor's business.
The second regiment of the Huscarle of House Diisarirga is typically called the Duchess's Home Guard and is responsible for security in Diisarirga Caverns and elsewhere in the system, such as at the Starport. The Home Guard also runs what custom service there is, as well as Diisarirga's deep meson sites and the system defense boats belonging to Diisarirga.
The final regiment of the Huscarle is the mercenary company typically known as Silvan's Troopers. It consists of a number of units which are deployed with their Broadswords and Kalashnikov Mercenary Cruisers.