Force Protection Condition (FPCON) Delta is the highest alert status within the FPCON system, indicating a “critical” threat level. When a base is at FPCON Delta, the military implements significantly increased security measures to protect personnel, facilities, and equipment from possible attack. Depending on the specific military base, these measures can include increased physical barriers, heightened patrols, and more restrictive access.

When a base reaches FPCON Delta, it is usually one of the following:

• Imminent threat: An imminent threat indicates a terrorist attack is expected to occur within 24 hours, or other significant hostile activity has been confirmed and is expected to occur soon.
• Hostile action: A hostile action is any activity that is potentially dangerous or harmful. This could include a suspicious event, the uncovering of a terrorist plot, suspicious foreign activity, or an armed conflict.
• High alert: High alert means the base is on heightened alert and the threat level is considered “high”. This could mean increased patrols, greater access restrictions, and other security measures.
• Time-sensitive threat: A time-sensitive threat is one that is expected to occur soon and therefore requires a rapid response. This could include a pending terrorist attack, an imminent hostile action, or some other form of threat.

When FPCON Delta is declared, personnel are encouraged to take additional precautions to remain vigilant and aware of their surroundings. This includes reporting any suspicious activity, locking doors and windows, and avoiding large crowds or areas with high foot traffic. Personnel should also follow the instructions of base security personnel, who are responsible for implementing additional security measures.

In general, FPCON Delta is an indicator of a heightened state of alertness. It is important for personnel to understand the implications and be aware of their own safety. By doing so, they are better prepared to react to any potential threats in a timely and effective manner.