Drones

Drones were great for a while, as long as it was only the U.S. military that used them. Now the Pentagon is waking up to the possibility that potential enemies like China, Iran and North Korea might use them against America.

But it's not just drones that are the threat. It's swarms of drones, perhaps tens or dozens or hundreds, spying or striking at U.S. troops. A poor man's form of asymmetric warfare capitalizing on the simple fact that you can strap a camera or a bomb to a $300 flying robot that a 10-year-old can operate.

China and Russia have drones. Iran claims to have developed a whole family of them, including an alleged stealth drone and a "kamikaze" drone. Iran also loves swarm tactics. It plans to swarm U.S. Navy warships with floating waves of armed speedboats or overwhelm American tanks with hordes of anti-tank motorcycles.

For U.S. forces spoiled by 70 years of unchallenged superiority, it will come as a rude shock that the skies are not friendly.

How the U.S. Army Plans to Defeat the Unthinkable: Drone Swarms