What are the four threat levels used by commanders to determine Force Protectin Condition?

The four threat levels used by commanders to determine Force Protection Condition (FPCON) are FPCON Normal, FPCON Alpha, FPCON Bravo, and FPCON Charlie. FPCON Normal indicates a general peace time environment with no specific threats. FPCON Alpha signals a low threat level, requiring a heightened awareness and readiness. FPCON Bravo reflects an increased risk of terrorist attacks, while FPCON Charlie indicates a significant or imminent threat, necessitating strict security measures.