Delivery of lots of things for search and rescue operations would probably be pretty useful, if somewhat niche. I've heard of quite a few S&R stories where the

Delivery of lots of things for search and rescue operations would probably be pretty useful, if somewhat niche. I've heard of quite a few S&R stories where they knew where the person was but couldn't safely get there until daylight. It seems like being able to drop off a care package in such situations would be useful. In some situations like harsh cold snowy weather a drone is unlikely to be of much use, but dropping a couple of liters of water to someone stuck overnight in the desert could be the difference between pulling in a dangerously dehydrated lost hiker in the morning versus picking up someone who just needs a lift back to civilization. Of course, drones (even sans delivery ability) seem like a good fit for S&R anyway -- relatively cheap (compared to manned helicopter searches) and safe way to cover last known areas of missing folks to try to locate them from the air.