Trell Military

The Trell Military is broken up into three branches, the ODF (Orbital Defense Force), ISMC (Interstellar Marine Corps), and ISNF (Interstellar Naval Fleets).

Orbital Defense Force
Most inhabited worlds and stations have their own ODF, a force of volunteers drawn from the general populace dedicated to the security and protection of that world or installation. They are given basic training, equipment, and supplies.

Within the ODF there are four branches. There are the Medical Corps, Engineering Corps, Corps of Riflemen, and Artillery Corps.

Interstellar Marine Corps
Originally the ISMC was a section of the ISNF but has now become an autonomous branch of the military. The Marines are based on the model of the Empyreal Empire's Mobile Terrestrial Regiments and act as a mobile military force.

There are several branches of the Marines. There are the Infantry Corps, Armored Corps, Orbital Strike Force, and the Corps of Specialists.

Interstellar Naval Fleets
The Trell Navy is broken up into seven "fleets" of a couple thousand ships each. It's rare, however, for an entire fleet to all be in formation at a single time. Usually at least a third of the fleet is out on "detachment runs", up to several sectors away.

In addition to their ships, the Navy also has a small group of elite soldiers called "Naval Security" or simply "NavSec".

Chain of Command
All three branches of the military in the end report to Tactical Command or "TacCom". Within their branch, the Navy reports to Naval Command or "NavCom", the Marines report to Marine Command or "M-Com", and every ODF reports to their own Orbital Command, or "O-Com".