During initial treatment of mustard casualties, first responders should ensure what type of protection?

The correct choice emphasizes the critical need for both respiratory and skin protection when responding to mustard gas casualties. Mustard agents, which are classified as chemical warfare agents, can cause severe injuries upon contact with the skin and when inhaled. These agents are known for their ability to cause blistering on the skin and significant respiratory damage.

Ensuring respiratory protection is essential because inhaling mustard gas can lead to severe lung damage, including respiratory distress, pulmonary edema, and potential death. Skin protection is equally important to prevent dermal exposure, which can result in painful blisters, burns, and other debilitating injuries.

Effective first responder protocols involve the immediate donning of proper personal protective equipment (PPE) that meets the necessary standards for chemical exposure. This includes masks that can filter out harmful chemicals and protective clothing that prevents skin contact. Consequently, the focus on protective measures secures the safety and effectiveness of the first responders while minimizing further harm to casualties.

While universal body coverage, PPE removal, and basic first aid supplies are also relevant considerations, they do not specifically address the immediate need for dual protection against inhalation and skin exposure posed by mustard agents, making respiratory and skin protection the top priority in such scenarios.