My idea is that each company is wholly dedicated to an part of warfare. Assault, tactical support, devastation, etc..
Working off an idea of an iron council type leadership where there is 1 chapter master and 9 captains. They are given missions and they will take what units they need for the mission. Similar to how Njall had a smattering of wolves from different wolf companies.
Every marine will spend a decade or two moving around through the different companies building experience in new types of warfare. The scout company teaches them the basics but the time spent in the company that specializes is where they get most of their elite level training.
The organization initially was as standard codex marines. Cawl developed this chapter using the geneseed of the 11th primarch against Guilliman's wishes. They were assigned missions focusing on Tyranid tendrils. The company is fleet based and travels around specifically targeting Tyranid invasions. But will assist others when the need arises. So, what ended up happening is that the companies were finding themselves under equipped to fight in specific battles and were constantly having to re-arm and re-supply. In an effort to stem this inefficiency and due to them being so far away from Terra they have decided to kit out their companies to the missions needs. Not every company needs a Repulsor or Dreadnoughts to complete their mission. They take what they need and then return to the fleet so their resources can be used again.
The companies themselves are not always together. When marines return from their mission, except the captains, they remove their company marking. So that all captains know they are available for deployment. In this way every company that deploys will be fighting at full strength even if the chapter takes a large hit and has their numbers dwindle.
Still working on this a lot I just wanted to jot down some of the ideas flowing through my head. Nothing is set in stone yet. Just letting it all out lol
Edit: The marines have taken to meditations and have built a series of rooms in their flagship that has bamboo farms and sand gardens. The pursuit of knowledge is encouraged among them and they all find that they have a strong desire to record and collect accurate histories. This has caused the chapter problems on some planets where they have deemed the histories false and have put them to torch, replacing it with the imperial truth.
Edited by Aothaine, 14 February 2020 - 08:53 PM.