What information about the casualty must be included in an evacuation request?

The correct choice emphasizes the importance of including the casualty's nationality and status in an evacuation request. This information is vital for several reasons. First, knowing the nationality helps determine the appropriate chain of command and can affect the evacuation process based on legal and diplomatic considerations. Additionally, understanding the casualty's status—whether they are a military member, contractor, or civilian—provides context that can influence the type of care required during evacuation and the resources necessary to transport them safely. Proper identification of the casualty's status can also assist medical personnel in prioritizing treatment and ensuring that the evacuation adheres to relevant protocols.

While knowing the casualty's last meal, details of the injury, and preferred treatment can be relevant to medical care, they are not as critical in the logistics of the evacuation process itself. The focus of an evacuation request should primarily align with the necessary information for a safe and effective transport, which is why the nationality and status are paramount.