Which document serves as an official record of an incident and must be clear and comprehensive?

The document that serves as an official record of an incident and must be clear and comprehensive is DHS form 3155. This form is specifically designed for documenting incidents in a detailed manner, ensuring that all relevant information is captured accurately. Clarity and comprehensiveness are essential for this type of record-keeping, as it allows for proper analysis, review, and potential follow-up actions based on the documented facts.

In incident response, having a thorough and well-structured record helps maintain accountability, supports investigations, and facilitates communication across different stakeholders within the Department of Homeland Security and other agencies involved. Thus, utilizing DHS form 3155 ensures that all necessary details are recorded, promoting effective management and response to security incidents.