The Transparent Armor Gun Shield, or TAGS, is a visually transparent protective gun shield built by BAE Systems made with ballistic glass for US military vehicle operators using mounted machine guns. [1] It borrows on the experience of the Israeli Defense Force in using such armor on a variety of vehicles. The shield is intended to provide protection for its user while maintaining visibility. [1] It can be mounted on several models of armoured fighting vehicles (AFVs), including the M113, M1 Abrams and Stryker, as well as on the HMMWV.