Ninja the hedgehog: The reason for the reversal on the reserved is because there was a point that this was going to be part of a levelpack, with a single player wad being the main 'hub', and match mode being a feature of the area. If you look at the wad in an editor or use objectplace, you'll see that the areas claimed to be closed for war are drawn, with 3 rooms per wing.
The rooms were planned to be:
Campaign: Main Single Player missions.
Tutorial: Tutorial Levels for new players.
Skirmish: This Wad
Dodge: Dodge lasers for a set time to complete
Flag: A ctf variation, with an additional military base
And I can't remember the others. I'll EDIT them in later.
EDIT:
Sorry, had to leave in a flash. The Parking space was going to be a secret entrance after the standard campaign was completed.
But after some problems involving custom exits, the idea was scrapped, not likely to return.