Drones with grenades? Skynet is close at hand (start watching for big robots that look like a naked Arnold Schwarzenegger).
Turns out the Marines are loading grenades onto quadcopters for use in the battle field. Don’t want to get too far into the philosophies of sci-fi dystopian possibilities. But having drones carrying grenades seems like a very bad idea. Having robots, drones, AI in the battlefield take it to a new level, perhaps beyond the capabilities of humans to manage. I.e., Skynet.
But if you just like military tech, you can read about it in this article. There is a pretty cool video.