In April 2013, a National Air Cargo Boeing 747 took off from Bagram Airfield in Afghanistan. But just seconds after liftoff, the giant aircraft suddenly pitched up almost vertically. The crew struggled to push the nose down — but the jet kept rising until it stalled. Moments later, it fell straight to the ground and exploded. The investigation revealed the cause: Inside the cargo hold, five armored military vehicles weighing over 80 tons had broken loose during takeoff. They smashed through the

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