Which NISPOM chapter is least likely to apply to all facilities?

Chapter 7 of the NISPOM, which focuses on Subcontracting, is the least likely to apply to all facilities because not every facility engages in subcontracting activities. The necessity for compliance with this chapter depends on the organization's structure and its involvement in the supply chain or outsourcing work. For instance, small businesses or organizations that perform work solely on their own do not need to adhere to the same subcontracting regulations and may not involve subcontractors at all.

In contrast, the other chapters address fundamental aspects of security that are pivotal for any facility handling classified information. Chapter 5 covers the safekeeping of classified information, which is essential for any facility that has access to such materials. Chapter 4 addresses personnel security, which is a crucial requirement to ensure that individuals in a facility are appropriately vetted and trusted. Lastly, Chapter 6 is vital for managing the conduct of visits and meetings when dealing with classified information, a necessity for all cleared facilities to maintain security integrity.