What is indicated by MOPP level 4?

MOPP, or Mission Oriented Protective Posture, is a system used by military personnel to indicate their level of readiness and protective measures against chemical, biological, radiological, and nuclear (CBRN) threats. MOPP level 4 represents the highest state of preparedness. When MOPP level 4 is indicated, it means that an attack is not just probable but imminent, requiring personnel to take all necessary actions to protect themselves and their equipment. This includes wearing full protective gear and being positioned to respond immediately to any CBRN incident.

In contrast, lower MOPP levels, such as levels 1 and 2, suggest that there may be a possibility or probability of an attack but do not necessitate the same level of immediate readiness. MOPP level 4 is specifically tailored for scenarios where an attack is expected to occur very soon, making it crucial for personnel to execute all protective measures as swiftly as possible.