All F-35 strike force fighters have been grounded as a precaution after a routine engine inspection revealed a crack on an engine blade.
Defense Department Officials are calling this a "cautionary suspension of flight." The Air Force, Navy and Marine Corps fly F-35.
A number of the new fighters are stationed at Eglin Air Force Base. Training started there just last month.
Inspectors found the crack in an engine installed in an F-35 Lightning II Aircraft at Edwards Air Force Base, California. This is the conventional take-off and landing version of the joint strike fighter.
All F-35 flight operations have been suspended until the investigation is complete, officials said, and it is too early to know the fleet wide impact.