In case of a biological or chemical attack, what action should be taken if visible contamination is found?

When visible contamination from a biological or chemical attack is discovered, the appropriate action is to mark the area and stay away. This ensures that personnel do not inadvertently expose themselves to hazardous materials that could potentially cause harm. By marking the area, others can be alerted to the danger, helping to prevent further exposure and maintaining safety for all individuals in the vicinity.

Moving closer to investigate or trying to clean up the contamination poses significant risks, as it can lead to direct exposure to harmful agents. Similarly, covering the contamination could provide a false sense of security and may not effectively eliminate the danger. Therefore, marking the area and maintaining a safe distance is the most prudent course of action in such a situation. This approach emphasizes the importance of safety and proper protocol in handling potential threats from biological or chemical incidents.