My wife and I stopped in the large parking lot of a local federal building at night to try a few shots of a lunar eclipse.  It took only a moment for a security vehicle to come beside us and ask what was going on.   In this case, the guard stepped out and took in a view of the moon.  The guard kept some distance from us and the vehicle between  but there was not a mention of the camera.  I am sure other guards might be more invasive...and some may not know the new regulations.  Of course, we were in their parking lot and could have been asked to leave perhaps.

Thanks for the heads up.