Chapter 8 of the National Industrial Security Program Operating Manual (NISPOM) specifies the security requirements and procedures for information systems that handle classified information. The first Industrial Security Letter that the Defense Security Service issued in2007 expanded on and clarified topics presented in chapter 8 of the NISPOM. It is important for organizations with information systems that have been accredited for processing classified information to read and implement the guidance provided in that Industrial Security Letter, in addition to that in the NISPOM