One of the theories behind why they removed the glass was to install a homing beacon on the outside. Who knows, all that is obvious is that this was an inside job and the tower was brought down by something other than a jet crashing into it and the resulting fires.
I was about to say the same thing. Missile radar systems use a similar technique for calibrating the radars. Was that helicopter used for the calibration? That thought immediately came to mind.
One of the theories behind why they removed the glass was to install a homing beacon on the outside. Who knows, all that is obvious is that this was an inside job and the tower was brought down by something other than a jet crashing into it and the resulting fires.
I was about to say the same thing. Missile radar systems use a similar technique for calibrating the radars. Was that helicopter used for the calibration? That thought immediately came to mind.