1) Food & Medicines
Rescue teams needs military grade drones (with longer range, higher payload capacity, etc...) which can suplly food and medicines to victims.
2) Communication links:
a) Drones can carry a portable mobile base station (Enterprise/metro small cell) with satellite back haul, and can establish communication quickly
b) A mesh network formed by wireless communication equipment (say wifi or similar) each of which were carried by a drone can establish communications quickly
Adding robotic arms to drone makes a flying Robo. We can ask it to do any thing flying over water (which is not possible to humans)