Which of the following is one of the three special hazards in the U.S. Military Marking system for hazardous materials?

• A. Evacuate area immediately
• B. Chemical hazard
• C. Apply no water
• D. Wear protective mask or Breathing apparatus

Answer: (C)

In this marking system, some warnings are written as special hazard directives that tell responders exactly what not to do because certain actions can make the situation worse. The phrase “Apply no water” is the correct one because it is a specific directive used to indicate that water should not be applied to or near this material. Water can trigger a dangerous reaction, spread the substance, or release toxic vapors, so avoiding water is essential for safe containment and response.

The other options are general safety actions or PPE guidance rather than a special hazard directive. Evacuating the area is a standard safety step, “Chemical hazard” is a broad category, and “Wear protective mask or breathing apparatus” describes PPE, not a restricted-action warning like “Apply no water.”