Airline ID rejected at Reagan National

As with anything posted here, this could have been due to the whims of an individual TSA agent at Reagan National:

TSA agent checking boarding passes would not accept her airline ID as identification. Her FAA-approved, state-issued ID that allows her to walk through security gates at her own airport without even taking her shoes off. It had to be a driver’s license, she was told, and only a driver’s license. source