Final answer:
The Department of Defense issues the Common Access Card (CAC) as a multi-purpose smart card for identification and authentication of military personnel, contractors, and non-DoD employees.
Step-by-step explanation:
The type of smart card issued by the Department of Defense as a general identification/authentication card for military personnel, contractors, and non-DoD employees is the Common Access Card (CAC).
The CAC is used for a variety of functions including physical access to buildings and controlled spaces, login to DoD computer networks, and serving as an identification card.
The card contains embedded integrated circuits that allow for encrypted data storage and digital signature capabilities, enhancing the security of sensitive information and communication.