Remember the site was part of the White Sands facility once and still probably has some military components. It was passed to the civilian side. The antennas etc will still be potential functional military assets. Q has indicated that the black hats are trying to get communications and command facilities up both to communicate and to trick military units into fighting for them. The Trump/ Q team along with the white hats in the NSA/ CIA/ FBI are swatting these attempts. My guess is someone tried to use the mothballed sunspot assets. It was detected and people were sent in. They were expecting a fight with civilians at risk so the pulled people out. What was seen would have been after the fight. We may never know the magnitude of the fight or how many people on both sides.
There is an intentional decision not to use a cover story or tell the local Sheriff what happened.