The instructions on IASE will direct you to Smartcard Services (middleware) downloads from Mac OS forge. You will need middleware to use your CAC on OS X. You should refer to the instructions and downloads available from the web pages under Getting Started for End Users (Mac) on DISA's Information Assurance Support Environment (IASE) website. Public Key Enable) the system all over again.
Whenever you upgrade your operating system (OS), you will need to CAC-enable (i.e.