From the British base, a twin-rotor helicopter ferries U.S. Marines and equipment to Camp Dwyer, another British base that now is also home to the U.S. Marines 24th Expeditionary Unit.

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Pakistani journalists started arriving at bin Laden's Abbottabad compound soon after the helicopter crashed and started filing stories about the mysterious helicopter and its oddly shaped tail rotor.

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This means it can hover like a helicopter, but when flying forwards can reduce the speed of the main rotor and let the wings provide part of the lift.

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The second is the introduction of the world's first civilian tilt-rotor aircraft a cross between a light aircraft and a helicopter.

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When the helicopter began getting away from the pilot, he pulled back on the cyclic, which controls the pitch of the rotor blades, only to find the aircraft unresponsive.

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