Well...
Much of the work at GSFC was done in a cleanroom that had a viewing gallery- that is where I took the picture that clearly showed the telescope. There are some open house events at GSFC, and I am sure that when the telescope was there there were tours that included the viewing gallery.
The other pictures were taken in a large room next to that cleanroom - I had to walk through that room to get to yet another cleanroom for another project. I made sure that taking pictures was allowed before doing so.... as you might imagine there was a full-time guard put on it to make sure no one unauthorized got too close.
Security precautions were pretty high, given its cost.
And it's not exactly street legal...