Was at the park with my dog, and a few kids were flying some quadcopters. I was thinking how difficult it would be to shoot these hihgly agile drones with small arms, and how these could be significantly useful as anti-personnel devices with a small shaped charge on them. Even like an actual missile or even a large UAV dropping a swarm on top of infantry or a mechanized column, a bunch of miniature kamikaze drones could wreak havoc.
Similarly Wheeled drones carrying shaped charge which sit dormant on the desert floor and can get activated when it sees a hostile vehicles moving, essentially becoming adaptive smart mines.
There is a lot of lethality to leverage from drones, I hope the services are paying attention.