I was there a few weeks ago and didn't see any signs. However, I locked up in the car anyway since I was going to be crawling around in turrets and tight passageways and didn't want to deal with any potential snags/etc.
It will be VERY HOT so pack lots of fluids. The hangar is very nice and has some really cool planes in it. Watch the video of the damage Katrina caused. They have done a good job getting the facility back up and running. I did not see a sign. Enjoy the trip.