The OS X Smartcard Services Package allows a Mac to read and communicate with a smart card. In addition, please review the DoD CAC Reader Specifications for more information regarding card reader requirements. At this time, the best advice for obtaining a card reader is through working with your home component.
Typically Macs do not come with card readers and therefore an external card reader is necessary. You can get started using your CAC on your Mac OS X system by following these basic steps: