The most increased Force Protection Condition (FPCON) level for a base is FPCON Delta. This level is the highest and most protective, typically declared when a terrorist attack has occurred or when intelligence indicates that terrorist action against a specific location or person is imminent. Under FPCON Delta, installation access is limited to mission-essential personnel and others as determined by the commanding authority, and security measures are at their strictest, including possible gate closures and intensive inspections
. The FPCON levels, in increasing order of threat and protective measures, are:
- Normal
- Alpha
- Bravo (baseline since 9/11)
- Charlie
- Delta (highest)
FPCON Delta is usually a localized condition and is not intended to be sustained for long periods due to its impact on operations and personnel
. The U.S. Northern Command typically sets the minimum FPCON level for installations in the continental U.S., but commanders can raise the level as needed based on credible threats
. In summary, FPCON Delta represents the most increased force protection level for a base , activating the strictest security protocols to protect personnel and facilities from imminent or actual terrorist threats
