One of the biggest threats to U.S. troops abroad isn’t a stealth fighter, a nuclear missile, or a massive cyber attack. It’s a swarm of cheap drones that can overwhelm the expensive defense systems troops have on hand now. “I’m talking about the [drone] you can go out and buy at Costco right now in the United States for a thousand dollars, four quad, rotorcraft or something like that that can be launched and flown,” Marine Gen. Kenneth McKenzie, the head of U.S. Central Command… – Task & Purpose Photo: US Army