Which FPCON level is most appropriate when terrorist activity is suspected but has not yet occurred?

The most appropriate FPCON level when terrorist activity is suspected but has not yet occurred is FPCON Bravo. This level indicates that there is an increased general threat of possible terrorist activity against personnel or facilities, but it does not indicate that any specific threat is imminent.

FPCON Bravo involves heightened security measures, including increased patrols and monitoring, to prepare for potential incidents based on intelligence or credible threats. It is designed to allow for better preparedness while not overreacting to threats that are not considered imminent.

In contrast, FPCON Alpha represents a precautionary level where there is a general threat that has been identified, but there is no substantial intelligence indicating that an attack is likely. FPCON Charlie indicates a more serious situation where there is a credible threat or an imminent terrorist attack is expected, warranting immediate and enhanced protective actions. FPCON Delta is the highest level of alert, implemented when a terrorist attack has occurred or when a specific threat against a facility is imminent.

Thus, FPCON Bravo is suitable for a scenario where there is suspicion and intelligence regarding possible terrorist activities, allowing for preventative measures before an incident occurs.