There are also off-planet structures, like AI controlled Magnetic Accelerator Cannons and the manufacturing yards i mentioned earlier. Trying to find a picture for them but here's one for the defenses. Put in place in the run up to the Vrangan Blitz, they prevented the ground defenses from being overwhelmed by sheer number of ships. Many of them were boarded and destroyed (a lá Halo 2) and the ones that were left have fallen into disrepair now.
[img=http://i1194.photobucket.com/albums/aa365/Catharyn_F_Harrison/Concepts/Railcannons_zps07ad20b9.jpg]

Here's quite a nice photo from the Vrangan Blitz. It featured some of the most intense fighting on Outremer since the First Contact War. I want to visit it in some way, whether its through data logs or something i don't know. What do you guys think?
[img=http://i1194.photobucket.com/albums/aa365/Catharyn_F_Harrison/Concepts/PlanetDefence2_zpsa04ac62d.jpg]