Common Access Cards (CAC)
Most .mil websites that require login use CAC as their primary method if identity verification. Follow these instructions for realigning CAC to the PIV Authentication certificate.
MilitaryCAC offers a wide range of support for users needing assistance in using their CAC for all services. Highlighted pages include the support pages for using CAC on Windows 10, macOS, and Linux. Users needing further assistance can easily get help here.