Transparent Aluminum!

Air Force testing new transparent armor, Air Force News Service

“Engineers here are testing a new kind of transparent armor – stronger and lighter than traditional materials – that could stop armor-piercing weapons from penetrating vehicle windows. The Air Force Research Laboratory’s materials and manufacturing directorate is testing aluminum oxynitride – ALONtm – as a replacement for the traditional multi-layered glass transparencies now used in existing ground and air armored vehicles.”