FWIW and iirc-the glass is a pancake with an internal layer that the digital signal of the text sends across the material in the middle layer. The glass on either side is not bullet proof, but optically high quality. Again, this was 8 years ago iirc.
You can see a bullet barely miss Trump’s head in the photo.
https://x.com/catturd2/status/1812309488357007468?s=19