A week ago, the FBI asked the director of the observatory to evacuate all personnel. No further explanations have been offered. Whatever is going on there, thankfully all personnel were evacuated safely.
The facility overlooks White Sands, so the most likely explanation is counter-espionage. But it’s hard to see why that would require evacuation.
If this is a counter-espionage op, it’s a darn poor one. The FBI (or whoever is actually running it) failed to secure the site beyond a few pieces of tape at the entrance. An intrepid youtuber took a walk around the place, prompting security to be hired and placed at entry points. Drone footage has also been loaded on youtube.