Which of the following chapters from the NISPOM may NOT apply to all facilities?

The choice that may not apply to all facilities is Chapter 10, which covers International Security Requirements. This chapter specifically addresses the security measures necessary for facilities that deal with foreign governments or international defense arrangements. Not all facilities within the National Industrial Security Program (NISP) engage in international activities, and therefore, the requirements outlined in this chapter may not be relevant for every facility.

In contrast, the other chapters address foundational security practices that are essential for all facilities under the NISP. Chapter 1, for example, lays out general security requirements that apply universally to all facilities. Similarly, Chapter 5 pertains to security clearance procedures relevant to every facility that handles classified information, and Chapter 3 focuses on personnel security, which is also a critical aspect of overall facility security regardless of the facility's specific involvement with international elements. Thus, while all facilities must adhere to general security standards, international security requirements do not necessarily apply to those that do not engage with international entities or classified information from foreign governments.