Final answer:
The system of interconnected computer networks used by the United States Department of Defense and the United States Department of State is called JWICS.
Step-by-step explanation:
The system of interconnected computer networks used by the United States Department of Defense and the United States Department of State is called the Joint Worldwide Intelligence Communications System (JWICS). JWICS is a secure network that allows for the exchange of classified information between various government agencies. It provides a secure and reliable means of communication for military intelligence and diplomatic purposes.