The U.S. military is investing billions of dollars each year in developing autonomous technologies that could enable planes, helicopters and drones to fly into some of the world’s most dangerous places, without a human pilot.

AI-empowered systems may soon allow autonomous flying machines to reduce the number of pilots and soldiers working in high-risk environments. Could these flying robots also be firing weapons? WSJ’s Jason Bellini reports, in the latest episode of Moving Upstream.