What action is taken at CBRN MOPP level 4?

At CBRN MOPP (Mission Oriented Protective Posture) level 4, the primary action is to set General Quarters (GQ). This level represents the most heightened state of readiness in response to CBRN threats, where maximum precautions are taken to protect personnel and equipment.

Setting General Quarters involves assembling the crew, preparing for potential chemical, biological, radiological, or nuclear attacks, and implementing full protective measures. This includes donning all necessary protective equipment and ensuring that all personnel are accounted for and ready to respond to any situation that arises.

In contexts of CBRN readiness, the other actions like issuing personal protective equipment (PPE), setting material condition zebra, and activating the CMWD (Chemical, Biological, Radiological, and Nuclear Defense) system are all important parts of the response process but typically occur in conjunction with or before reaching MOPP level 4. Thus, the action of setting GQ underlines the urgency and preparedness required at this highest MOPP level.