Final answer:
The document that DSS publishes to clarify policy requirements in the NISPOM is called the Industrial Security Letter (ISL). It provides guidance and updates on regulations, policies, and procedures related to industrial security.
Step-by-step explanation:
The document that the Defense Security Service (DSS) publishes and posts on its website to clarify existing policy requirements in the National Industrial Security Program Operating Manual (NISPOM) is called the Industrial Security Letter (ISL).
The ISL is used to provide guidance and updates on regulations, policies, and procedures related to industrial security. It helps organizations understand and comply with the requirements outlined in the NISPOM.
For example, DSS may issue an ISL to clarify certain sections of the NISPOM, provide additional implementation guidance, or announce changes to the policies or procedures. The ISL is an important resource for organizations involved in the defense industry to stay updated and compliant.