Solomani Army: Motorized Battalion
GURPS Ground Forces lists an Imperium Marine line company with three hundred and nine personnel, divided into five platoons and a headquarters element, not counting reinforcements and attached support elements, like tanks and artillery. And a regiment has nine line companies.
The sources that I consulted seemed to agree that three hundred is about the minimum number of people you can organize into a battalion; remember, armed people on horses count twice.
Unless they are a pre-existing military unit co-opted or hired to operate under the aegis of a motorized battalion headquarters element, it's likely the motorized battalion has to be raised mostly from the local recruiting pool, and equipped from available equipment. So basically an ad hoc military unit built up for scratch.
Because of the likely exigencies of time, training will tend to be basic, and equipment cheap, cheerful and easy to maintain.
At first I thought, headquarters and support elements, and two line companies.
And then it occurred to me, what if we skip the company level, and divide them into nine manoeuvre elements, allowing maximum flexibility?
The smallest element would be a three man fire and manoeuvre cell. They're probably equipped with some type of smallarm, hand grenades, and a rifle grenade. They make up the major component of a fire ream, which includes a driver and what we'll term for our purposes a jeep.
Four fire teams plus a headquarters element make a platoon. The headquarters element consists of the platoon commander, the platoon executive officer, medic specialist, and driver. Nine platoons equal a total tone hundred eighty personnel.
Heavy weapons platoon, consisting of two heavy machine gun teams, nine medium machine gun teams, two medium mortars crews, two recoilless cannons teams. The heavy weapons are by default mounted in suitable vehicles, though can be easily dismounted. The machine gun mountings are also configured for the anti-aircraft role. Heavy weapons teams consist of the heavy weapons three man cell and a driver, except for mortar crews, that have five gunners and a driver. The medium machine gun teams, or Manoeuvre Support Team, are assigned one to each rifle platoon, the remainder are attached as required, but usually under the direct command of the heavy weapons platoon commander, the heavy weapons platoon headquarters element consisting of him, his executive, and two drivers. Probably you need a general purpose man portable missile team, to take out aircraft or armoured vehicles.That would be seventy two men.
The motorized battalion headquarters platoon consists of the battalion commanding officer, the battalion executive officer, the battalion adjutant, the SolSec political officer, the intelligence officer, the supply officer, the operations officer, the signals/computer officer, the battalion surgeon, the engineering officer, the transport officer, and the battalion senior NCO. Because of the ad hoc nature of a newly raised motorized battalion, not all officers need be commissioned, or even warranted specialists, since they're considered more like necessary slots that allow the battalion to accomplish whatever mission it's given. A transport team is attached. And I guess you need a sensor team. So that's twenty.
The battalion mess team, the battalion designated sniper, the battalion reconnaissance team, the maintenance team, the medical team, the assault team, the quartermaster team. That's twenty five.
That leaves three spaces for task group commanders.
About a quarter of the battalion are drivers, nominally commanded and assigned by the transport officer, who's in charge of the motor pool and maintenance section. Drivers aren't expected to participate directly in combat, because their function is considered to be equally important, that of providing mobility. But they are also trained as Jack of all Trades, how to handle communications equipment, and expected to plug a gap in capabilities as they occur. They are issued a smallarm, and if they cannot withdraw from a firefight, are expected to participate in it.