The reason for an unmanned drone is, the army does not want to risk more personnel in a war zone. Especially medical staff that are critical to keeping the trained soldiers alive.
The AirMule unmanned ambulance can land and take off vertically, with space for to passengers or 450kg in weight. Drone powered by an internal engine can operate efficiently hard terrains like mountains or cities. This engine type makes the drone better than a helicopter because they don’t have big propellers. One other advantage is the drone’s maximum range is 31 miles. They can quickly send behind the enemy lines to the combat area. The AirMule’s testing is almost over. Tactical Robotic expect to finish fully operational one in 2016. But still not certain when they will be used on battlefields.
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