Which term best describes the National Industrial Security Program Operating Manual (NISPOM)?

The National Industrial Security Program Operating Manual (NISPOM) serves as a primary reference for all security measures related to the safeguarding of classified information within the private sector. It consolidates security requirements and procedures for contractors who handle classified materials under U.S. government contracts. As such, it provides essential guidelines and standards that help ensure compliance with federal regulations governing industrial security.

In this context, referring to NISPOM as a primary reference is fitting because it acts as the definitive source of information and rules that organizations must follow to protect national security information securely and effectively. This foundational role sets it apart from other designations that might imply less authority or specificity in guidance, establishing its importance in the security framework of industrial contractors.