Do I present my common access card at the checkpoint to access the TSA PreCheck™ lane?

No. All members of the U.S. Armed Forces must include their DoD ID number in the known traveler number field when making flight reservations and a TSA PreCheck™ indicator must be visible on your boarding pass. The airlines will print a TSA PreCheck™ indicator (such as TSAPRECHK, TSA PRE, or TSA PreCheck™) on boarding passes to help you recognize when you are eligible for TSA PreCheck™ on your flight.

You cannot access the TSA Pre✓® lane by presenting your CAC or other documentation.