The U.S. Navy has grounded the Marine Corps' F-35B variant on Friday after an exhaust system failure. A and C-model variants were said not to be affected.
The incident came just days after the
Pentagon's director of testing and evaluation released an 18-page report
detailing an array of problems which he said underscored the "lack of
maturity" of the $396 billion fighter program.
report and Friday's grounding of the B-model highlighted the continued
growing pains of the ambitious Lockheed fighter program, which began in
2001 and has been restructured three times in recent years.