OK, I admit it, I'm behind the power curve again, or at least behind the news. (You know you're behind the news curve when you don't find out about tech developments till they show up in comics.)
In any case, the military is now testing a transparent aluminum compound for use as an armor. You can find a picture here. The compound is actually Aluminum Oxynitride. I've repressed enough of my analytical chemistry that I can't give you the chemical formula, but the summary is that it's a scratch-resistant ceramic that can replace window glass in armored vehicles. You can find details in this Air Force article.
I'd be very interested in knowing more about the mechanical properties of this material. Right now, the canopies for light aircraft are often made of plexiglass or similar plastics. They're light and resist shattering, but they tend to accumulate scratches. A scratch-resistant canopy would be a great feature.