What is the main purpose of the Common Access Card (CAC)?

The Common Access Card (CAC) primarily functions as a credentialing tool for both physical and logical access within the Department of Defense (DoD). It serves as a secure identification card that provides authorized individuals access to various DoD facilities, and it also enables secure access to computer systems and networks. This credentialing function is vital for ensuring that only authorized personnel can enter sensitive areas and access classified information, thereby enhancing security and protecting national interests.

The CAC's design integrates multiple features including a smart chip that contains personal identification and encryption capabilities. This allows it to serve not only as an ID card but also as a means of authentication for various digital services. This multifaceted purpose is essential in a military environment that requires stringent security measures.

While other options may seem relevant to military operations in their own contexts—such as offering discounts, facilitating training or managing finances—they do not align with the core function of the CAC. Thus, the credentialing purpose is the most accurate choice regarding the role of the Common Access Card in ensuring secure access to both physical and digital spaces within the DoD.