A pilot training in one of America's most expensive weapons systems ejected over South Carolina. Officials can't find the F-35 he was flying.

• A pilot ejected from his F-35B Lightning II jet after a "mishap" during a Sunday training flight.
• While the pilot was unharmed, the jet was lost and has not yet been recovered by officials.
• The F-35 Lightning II Joint Strike Fighter program is the DOD's most expensive at $1.7 trillion.

An expensive F-35 jet has been lost somewhere in South Carolina following a training mishap.