...what would be noteworthy enough for weirdo government agencies to have a footnote about his world?

Oh. Right.

"Date's AC 199. We've got four colonial clusters orbiting Earth, and currently running a terraforming project on Mars. We just finished up two sphere-wide wars, and Preventers are the extinguishers for the wildfires that spring up."

Now the history's out of the way...

"Ever hear of a Gundam?"