I'm building a military for this sci-fi book I'm writing, and I'm struggling with the hierarchy of command this military should follow. At this point, I'm just worried about the planetary forces, though space organization is on the cards for later.
This force has an army, a wet navy and an air force. For now, I'm focusing on the army only.
A little bit of background: In my world, the faction I'm militarizing for (The Alliance) controls around 40% of the galaxy. This Dominion is divided into 5 zones, each superintended by a Legion of the planetary army. Each Zone is further subdivided into 4 Quadrants, and each quadrant into 9 Sectors. This is what I have come up with so far:
Team (4 Troopers) - Team Leader (NCO)
Squad (8 Troopers/ 2 Teams) - Squad Leader (NCO)
Quinquagint (50 Troopers/ 6 Squads + 2 Scouts) - Quinquagint Leader (NCO)
Century (100 Troopers/ 2 Quinquagints) - Centurion
Platoon (500 Troopers/ 5 Centuries) - Sergeant
Company (2,500 Troopers/ 5 Platoons) - Captain
Battalion (10,000 Troopers/ 4 Companies) - Lt. Colonel
Regiment (50,500 Troopers/ 5 Battalions + 400 Engineers + 100 Scouts) - Colonel
Brigade (110,000 Troopers/ 2 Regiments + 9,000 Logistical) - Brigadier General
Division (500,000 Troopers/ 4 Brigades + 3 Reserve Battalions + 5,000 Medical + 25,000 Logistical) - Major General
Corps (1,500,000 Troopers/ 2 Divisions + 10 Reserve Battalions + 400,000 Logistical) - Lt. General
Overcorps (3,000,000 Troopers/ 2 Corps) - General
Army (10,000,000 Troopers/ 3 Overcorps + 1 Reserve Division + 500,000 Logistical) - Ubergeneral
Field Army (40,500,000 Troopers/ 4 Armies + 4 Reserve Battalions + 6,000 Scouts + 24,000 Medical + 30,000 Logistical) - Field Marshal
Front Command (170,000,000 Troopers/ 4 Field Armies + 2 Reserve Overcorps + 1 Reserve Corps + 500,000 Logistical) - Front Commander
Sector Army (860,000,000 Troopers/ 5 Front Commands + 10,000,000 Logistical) - Sector Commander
Sector Command (3,450,000,000 Troopers/ 4 Sector Armies + 1 Reserve Field Army + 500,000 Logistical) - Commander-in-Chief
Quadrant Army (14,000,000,000 Troopers!/ 4 Sector Commands + 2 Reserve Front Commands + 460,000,000 Logistical) - Primus
Quadrant Command (75,000,000,000 Troopers/ 5 Quadrant Armies + 1 Reserve Sector Command + 1 Reserve Sector Army + 4 Reserve Front Commands + 10,000,000 Logistical) - Omegus
Zonal Army (350,000,000,000 Troopers/ 4 Quadrant Commands + 3 Reserve Quadrant Armies + 5 Reserve Sector Armies + 4 Reserve Front Commands + 2 Reserve Armies + 3,000,000,000 Logistical) - Alpharion
Legion (4,000,000,000,000 Troopers/ 10 Zonal Armies + 4 Reserve Quadrant Commands + 10 Reserve Quadrant Armies + 60,000,000,000 Logistical) - Maxima
Army (20,100,000,000,000 Troopers/ 5 Legions + 100000000000 Logistical) - Optimus
How can I improve this army hierarchy? Any and all suggestions are welcome.
P. S: Before you ask, artillery units are included in the above classification. The number of units carried differs from group to group. Since each unit only received direct orders from the immediately superior command, it is sufficient to refer to them as, for instance, 4th Company, among the 4 in the Battalion. When orders need to come from higher up, each unit has an identifying UID, down to the last trooper.
Edit: In lieu of a demand for specific questions, I have some:
How big will the forces engaged in actual fighting get? Will there ever realistically be a situation where, say, an entire Sector Army will be deployed?
Is the amount of logistical staff at each level accurate, or will there be need for editing?
Can any of the names be changed or ranks removed? I want a few less ranks of possible, without impairing function.
Note: The logistical staff are assisted by powerful computerized systems and armies of drones and droids in their duties, so each Alliance logistical staff is worth multiple modern ones. Additionally, each Legion is responsible for defending 8% of the known galaxy, and the numbers reflect that.
In fact, except the Sector, Quadrant, and Zonal command staff and a few garrisons on important planets, most soldiers aren't even on constant duty. They return to their old lives as farmers, engineers, even scientists and philosphers, until there is a mobilization order (garrison duty rotates every two years).