The next major military threat to America won't be a ballistic missile crossing the Pacific—it will arrive quietly, right off the coast of Florida. US defense planners are panicking over the rapid rise of Chinese and Russian "carrier drone" technology—massive unmanned motherships that can transport and release hundreds of kamikaze drones deep inside enemy territory. With Cuba located just 90 miles away, these low-altitude swarms could completely blind and exhaust expensive American air defenses. In a desperate race against time, the Pentagon has jacked up its autonomous warfare spending to a staggering $55 billion. Watch why.