What should be written as "N/A" on the DHS Form 3155?

The appropriate entries marked as "N/A" on the DHS Form 3155 would be items not related to the incident. This is because the purpose of the form is to collect pertinent information that directly pertains to the security incident being reported. When information is irrelevant or does not contribute to the understanding, assessment, or management of the incident, it is appropriate to denote it as "N/A." This helps streamline the data collection process, ensuring that the focus remains on critical information that impacts the security response and review.

In contrast, items relevant to the incident should be documented thoroughly as they provide essential insights into the situation. Additionally, responses from witnesses and individuals who refuse to cooperate could hold valuable information regarding the incident. Thus, marking irrelevant data as "N/A" supports clarity and efficiency in reporting and reviewing critical security incidents.