1 Subjects: “...unmanned aerial vehicles...”

2 Subjects: “...unmanned aerial vehicle...”

3 Subjects: “...unmanned aerial vehicles (UAVs)...”

4 Subjects: “...unmanned aerial vehicle...”

5 Subjects: “...Unmanned Aerial Vehicles (UAVs)...”

6 Subjects: “...Unmanned Aerial Vehicles (UAV)...”

7 Subjects: “...Unmanned aerial vehicles (UAVs)...”

8 Subjects: “...unmanned aerial vehicle...”

9 Subjects: “...unmanned aerial vehicle...”