V-22 Osprey: $118 million
This tiltrotor aircraft, which takes off and lands like a helicopter but can fly faster and farther like a fixed-wing plane, was first used in combat in Iraq in 2007. The Osprey's production has been bedeviled by design and construction problems: the craft claimed the lives of at least 30 Marines and civilians during its development alone (former Vice President Dick Cheney tried repeatedly to ground the plane). Still, because of its range and versatility, the Marine Corps plans to deploy a squadron of V-22s to Afghanistan by the end of the year.
