The Osprey takes off like a helicopter and flies like a plane at twice the speed of other helicopters. The Marines call the aircraft essential to its mission; on average, it deployed 20 to ships every day last year. Yet, the aircraft was grounded for three months across the military after a crash in Japan last November killed all eight airmen on board. That crash was the fourth by an Osprey in the last two years. While the military says it has mitigated the problem that caused these accidents, t