I can't remember the details, but the idea of a "drone swarm" was used on one of the so-called "police procedurals" - either the CBS "FBI" or "NCIS" series. You have to think it makes sense, though. Instead of flying a 1-billion dollar stealth jet, fly 100,000 $10K drones that are so small that on radar they barely show up. And when they do, they look like a flock of fat birds. AND nobody dies if one gets shot down. Look at the Ukraine method of taking out tanks... Fly a drone over a tank, looking for one with an open top-hatch. Drop a grenade. Leave behind a smoking wreck.