Ok. Right now imc their only 4 companies in the division and the job is babysitting a noble and his offspring in "The Reach".
Four companies in a division? That's more of a battalion or task force size element.
At the risk of stating something you already know, military units are usually organized something like this:
- Fire Team: 4-5 troops
- Squad: 2-3 fire teams
- Section: often omitted, if used it's 2-3 squads per section
- Platoon: Usually 3-4 squads, sometimes more, sometimes organized as 2-3 sections
- Company: Usually 3-5 platoons for line units. One of the platoons might be a heavy weapons platoon or other specialty unit. HQ and special companies vary widely in organization.
- Battalion: 3-5 line companies, often with some platoon-sized units attached to the HQ company (like recon, heavy weapons, transportation, etc.) Battalions are usually the smallest unit organized for long-term field operations as a semi-independent unit - smaller units don't have enough support infrastructure.
- Regiment: 3-5 battalions with a varying number of platoon and company-sized support units attached to the HQ.
- Brigade: Usually 2 or more regiments, again with support units attached to the HQ.
- Division: 3-5 regiments, sometimes organized as brigades. Many support units, some of battalion size.
- Corps: 3-5 divisions, with, you guessed, lots of support & specialty units. Some of these might be as big as a regiment.
- Field army: 3-5 or more divisions with numerous support units.
While battalions are usually considered the smallest unit for independent field operations, companies and even platoons might wind up on indpendent missions and detachments. However, they're going to need to rely on some outside help for supply & support.
John