At MOPP level 3, what additional gear must be donned?

At MOPP (Mission Oriented Protective Posture) level 3, the requirement is to wear additional protective equipment to safeguard against potential chemical or biological threats. The correct answer highlights the necessity of donning both the mask and the hood. This is crucial for ensuring that the respiratory system is protected from harmful agents, while the hood secures the head and neck area, minimizing exposure.

While wearing overboots, chemical gloves, or a smock and trousers may be important in various MOPP levels, they do not provide the specific respiratory protection mandated at MOPP level 3. This level emphasizes the importance of protecting the airway and preventing inhalation of harmful substances, which is why the mask and hood are specifically required as additional gear.