The Osprey is an especially complex aircraft with a troubled history. With two rotor blades above extended wings, it takes off like a helicopter and can fly like a fixed-wing aircraft — which means that pilots need expertise in both. Last year, nine Marines were killed in two separate crashes. One Osprey aircraft crashed in June during a training mission near Glamis, Calif., killing five. Another crashed in a valley in Beiarn, Norway, killing all four on board.

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Persons: Peter Dean, “, Dean Organizations: Marine Corps, Ospreys, Marines, Osprey, United States Studies, University of Sydney Locations: North Carolina, Glamis, Calif, Beiarn, Norway