Five people were injured on Wednesday when an Air Force CV-22 Osprey crashed at a Florida base during a routine training exercise, a military official said. The cause of the accident is under investigation. The Osprey was first developed by the army in 1982 and was nearly scrapped in 1989 by then-Secretary of Defense Dick Cheney, who said the costs were too high. Questions have been raised about its safety before, after a 1992 crash in Virginia and two crashes in 2000. The Osprey is a tilt-rotor aircraft that can fly like an airplane but lands like a helicopter.