Alright. I discover this when I am jumping around the base not helping my mates. But I think noone know it yet. So hopefully it helps. As they says, a picture means a thousand words.... here are the pictures...
First you need to be NOD. Get a blackhand cloak unit works best.
Then u jump on the GDI logo.
Press forward to jump again. And you should go up without any problems.
There is it. Your very own nuke corner.
Enjoy the view from the another side.
Ooo, and one more thing, kill thoese Hot Wires running around the barrack.
Thanks to ^B^ and [LnZ]xKiddoX for helping out with the jumping.
[ March 31, 2002: Message edited by: [aN9m0] ]