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

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

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

4 Subjects: “...unmanned aerial vehicle (UAV)...”

5 Subjects: “...unmanned aerial vehicle (UAV)...”

6 Subjects: “...electric unmanned ground vehicle (EUGV)...”

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

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

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

10 Subjects: “...unmanned-aerial-vehicles...”

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

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

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

14 Subjects: “...unmanned aerial vehicle swarm...”