NMCI is the name used for a large-scale effort to link Navy and Marine Corps computer systems on bases, boats, and in offices around the world. When completed, this internal WAN will use Internet technology to link soldiers in the field with support personnel on bases, etc. NMCI is an example of a(n):

The answer is "Intranet".

Explanation:

The intranet becomes an information exchange computer network, in which the resources collaborate with OS and other computing infrastructure within the organization. It is usually done without access from third parties and primarily uses for analysis of the data.

Here, the NMCI links the computer network of navy and maritime bodies on the bases of both the boats and the regional offices, that's why we can say that it is the example of the Internet.