The Greater Terran Union is composed of several self-governing commissariats, civilian governments overtly blended with the military chain of command. Every commissariat official holds dual civilian and military ranks allowed by their citizenship tier. A commissariat is governed by a Commissar-General, often held by a Marshall, appointed by the High Marshal and approved by the Commissariat's Regional Assembly. Most power in in regional government's is vested in the Commissar-General's Office, with the Regional Assembly channeling the will of popular sentiment, business interests, scientific organizations and non-governmental organizations.
Commissariat's may be created, expanded, reduced, or dissolved by order of the High Marshal, on approval of the National Assembly. By the late 27th century the GTU had several commissariats, and newly acquired territory was often reformed into new ones.
Commissariats extant in 2645 included
- Aurora Commissariat | Capital: Volga
- Sakaraya Commissariat | Capital: Yeni Ankara
- Outer Rim Commissariat | Capital: ???
- Raznum Commissariat | Capital: Wessar
- Augean Commissariat| Capital: ???
- Horizon Commissariat | Capital: ???
- Thermopolyae Commissariat | Capital: Thermopolyae Station
The Core Sector, centered on the Sol System and early GTU colonies is exempt from the Commissariat system, has no self governance and is ruled directly by the National Assembly. Highly important but lightly or uninhabited systems, such as the L-Cluster or the the Xani Core World are governed as part of the Core Sector.