Which statement best describes a security incident?

• A. Incidents not affecting PL 1-3 resources and possibly hostile
• B. Incidents involving loss of a PL 1 resource
• C. Medical emergencies on base
• D. Incidents affecting any resource

Answer: (A)

A security incident is defined by the presence of indicators that there could be a security threat, such as hostile activity or suspicious behavior, not solely by whether a critical asset was harmed. The best choice captures this by noting that incidents can be hostile and may occur even when no PL 1–3 resource is affected. It emphasizes that the warning signs and potential threat drive classification as a security incident, rather than only the loss or impact on the most sensitive assets.

Medical emergencies on base are emergencies but not security incidents, so they don’t fit the concept. Incidents involving loss of a PL 1 resource represent a serious event, but the defining idea of a security incident is the presence of threat indicators, not just the fact that a resource was lost. Saying incidents affect any resource is too broad and doesn’t focus on the security threat aspect.