Which network domains allow access to the Navy Doctrine Library System (NDLS)?

The Navy Doctrine Library System (NDLS) is designed to provide access to important doctrinal publications and resources for Navy personnel. Access to NDLS is typically granted through military networks that can handle sensitive yet unclassified information as well as classified information, ensuring that the right personnel have access to vital resources.

NIPRNET, which stands for Non-classified Internet Protocol Router Network, is the primary network for transmitting unclassified information. SIPRNET, or Secret Internet Protocol Router Network, is used for classified communications. The ability to access NDLS through both of these networks ensures that personnel can reach necessary documents regardless of the classification level of the information they are working on, facilitating operational readiness and doctrinal adherence.

In contrast, the other network combinations mentioned in the other choices do not provide the necessary structure or security to access NDLS. They may include networks that operate outside the scope of the Navy's doctrinal library or are not relevant to military operations, thereby lacking the integration required to effectively access NDLS resources. The use of both NIPRNET and SIPRNET ensures that personnel can seamlessly access doctrinal information, making this the correct answer.