What action is taken after the casualty is ready for evacuation?

The correct choice highlights the importance of ensuring that the DD Form 1380, which is also known as the "Field Medical Card," is completed appropriately before evacuating a casualty. This form provides critical information about the patient's medical status, treatments received, and ongoing medical needs. Accurately filling out this form is essential for continuity of care during the evacuation process, as it allows subsequent medical personnel to understand the interventions that have already been implemented and the current condition of the casualty. Having comprehensive and organized documentation assists in making informed decisions about further treatment needed once the casualty reaches a higher level of care.

While the other options may seem relevant in different contexts, they do not directly pertain to the immediate actions required for preparing a casualty for evacuation. Filling out the DD Form 1380 is a vital step to ensure that the casualty's medical history and needs are communicated effectively.