North Korea puts its DMZ-crossing drone fleet on display

During a recent military celebration in the North Korean capital Pyongyang, goose-stepping soldiers, tanks, and allegedly nuclear-tipped missiles were paraded past the cheering throngs. Also on display? The reclusive nation's fleet of military drones. And some of those drones have already crossed the border, posing a threat to both South Korea and the United States, which has 28,000 soldiers stationed near the demilitarized zone.