This is the place where my theories about androids, corvettes, and drones will go. Please feel free to comment below.
I think Drones could be made by some Earth security company and are just used by the Civils; this would explain their guns, and how the CS use them for defence/security. This would also explain why they do not have CS in their name.
I think Corvettes are also made by a different company, maybe the same company that makes drones. These drones are clearly meant to guard highly important areas, such as a time portal. I think the Corvettes were hacked by the Usurpations, which explains the three destroyers in level 41. I think the reason why the cs bosses are in level 40 is to attack the corvettes to get the time portal back.
The Androids are also made by some company (damn this repeats a lot), and that the Cs also uses them(at least the SLCs, not sure about the other androids though), and that they were hacked/malfuctioned and attacked Cs forces.