How about schematics/info about the air/ground vehicles used in the war, and maybe some small/medium arms. I know they show a few quick glimpses of them in the series.
Maybe a display of rank structure/insignia on both sides.
How about a couple of pages from the Blue Sun catalog.
Maybe insignia from other freightlines, passenger lines, independants, etc.
Maybe a page or two from newspapers from the remote colonies.
Product Insignia ie: food, weapons, gear, medical supplies, etc.
Information on other companies/conglomerates in the verse.
Ads for things like Bellerephon Estates, Serenity Valley National Park, private security companies, etc.
Okay, I think that's enough for now

.Apologies if I mentioned things already listed.