How big is it?
What's its purpose?
Remotely controlled UAV?
All very good questions....
Size...small, I presume around 13ft in diameter (I'll try to confirm this!)
Purpose...test vehicle
Manned
Probably not, it was replaced by bigger and presumably better models. Looks like it should have been in 2001
Edit, ignore the size....my theory blown apart....more like 40 ft in diameter!