What is the first line of information required in the 9-line procedure?

The first line of information required in the 9-line procedure is the location of casualties. This critical piece of information establishes where the medical evacuation (medevac) should occur, enabling responders and medevac crews to locate and reach the casualties promptly and efficiently. Given the potential urgency of a combat situation, having precise coordinates or a clear description of the location ensures that time is not wasted in identifying where to go, thereby improving the chances of effectively treating and evacuating injured personnel.

Additional lines of the 9-line procedure cover other crucial aspects, such as the urgency of the evacuation and the type of personnel involved, but without the location, the entire purpose of the medevac cannot be achieved. Identifying the position of casualties first is essential for coordinating a timely and effective response in tactical scenarios.