Just Between You, Me and the Border Worlds Outpost

This Border Worlds outpost is present in Wing Commander IV's files and complete with damage states... but it doesn't appear in the game and it's not clear what it might've been intended for!

Wing Commander IV features a lot of bases -- in fact, it has more space stations than the original game had fighters. What it doesn't have is a Border Worlds base... even when you're ordered to rescue the biochemist from the Border Worlds, you do it by landing marines on a Confederation space lab. It looks like they had originally planned to rectify that, though -- with the Union of Border Worlds Outpost.