Final answer:
The Defense Security Service publishes Industrial Security Letters (ISLs) on its website to update or clarify existing NISPOM policy requirements. These documents are crucial for organizations involved in the NISP to stay compliant with how classified information is handled.
Step-by-step explanation:
The document that the Defense Security Service (DSS) publishes and posts on its website to change or clarify existing policy requirements in the National Industrial Security Program Operating Manual (NISPOM) is known as an Industrial Security Letter (ISL). ISLs are used to update or clarify NISPOM policy and apply to all cleared contractors under the NISP. It's important for businesses participating in the NISP to stay current with these updates, as they affect how classified information must be handled and protected. Organizations need to frequently check for updates to ensure compliance as ISLs can be published at any time. When was the information published, revised, or updated is a vital question to ask while reviewing these documents to ensure the most current requirements are being followed. Additionally, verifying whether the topic requires current information and if links within the source are current is essential for staying up-to-date with policy changes.