drive to the near by military base and read the sign
Force Protection Delta, or FPCON Delta, is a threat level indicator where a terrorist attack has just occurred, is currently taking place, or is highly imminent based on recent intelligence. The FPCON levels are similar to the Defense Readiness Condition, or DECFON, levels. The main difference between these two systems are that the DEFCON system deals with military readiness against threats to the public while the FPCON system is specific to threats against the military.
Force Protection Delta, or FPCON Delta, is a threat level indicator where a terrorist attack has just occurred, is currently taking place, or is highly imminent based on recent intelligence. The FPCON levels are similar to the Defense Readiness Condition, or DECFON, levels. The main difference between these two systems are that the DEFCON system deals with military readiness against threats to the public while the FPCON system is specific to threats against the military.
FPCON Delta
Commander assigned AT responsibility
Commander assigned AT responsibility
Commander assigned AT responsibility
Bravo
Commander assigned AT responsibility
FPCON Charlie
It's the FPCON level that applies when evidence of terrorist attack planning may exist requiring strong protective measures, but the installation must continue its regular mission activities.
A, B, C, moderate, significant
Scroll down to related links and look at "Conversion of sound levels".