When preparing for casualty evacuation, you should:

The correct approach when preparing for casualty evacuation is to ensure that the casualty is adequately protected against environmental conditions. Completely covering the casualty, including the face, addresses the risk of hypothermia, which can severely affect their condition during evacuation. Hypothermia can occur rapidly in certain environments, and maintaining a stable body temperature is critical for the casualty's survival and recovery. By fully covering them, you are also lessening the risk of further injury or exposure to the elements, which can complicate their medical condition.

This response ensures that the casualty's safety and health remain prioritized during evacuation, which is vital in any emergency medical situation.