Which FPCON level indicates that terrorist activity is likely to occur?

FPCON Charlie is the level that indicates a credible threat of terrorist activity is likely to occur. This level entails enhanced security measures and a heightened state of alert. When FPCON Charlie is declared, personnel and resources are to be prepared for potential incidents, reflecting a proactive approach to imminent threats.

The distinction between FPCON Charlie and other levels is significant. For example, FPCON Alpha indicates a general, non-specific threat that is low and requires basic security precautions. Meanwhile, FPCON Bravo represents a more elevated risk than Alpha but does not imply a definitive threat. On the other hand, FPCON Delta is implemented during an attack or immediate threat, representing the highest state of alert. The escalation from Alpha to Bravo and then to Charlie shows a progression in perceived risk, with Charlie specifically identifying that there is a strong possibility of an attack.