Which of the following is a Mobility Mission?

The correct choice is expedient road repair, as it directly relates to mobility missions. Mobility missions in military operations focus on enabling forces to move quickly and efficiently within the operational environment. Ensuring that roadways are passable and quickly repairing any damage aligns perfectly with this objective, allowing for the rapid movement of troops, equipment, and resources.

In military contexts, having dependable logistics and quick routes is crucial for operational success. Expedient road repair minimizes disruptions caused by obstacles or damage, facilitating smooth troop movements and supply lines. This activity is essential in combat and conflict areas where infrastructure may be compromised.

Building fortifications, logistical support, and surveillance operations do not primarily focus on enhancing movement capabilities. While these activities are critical for overall mission success, they fall outside the specific scope of mobility missions aimed at maintaining and repairing transport pathways.