Dubbed, the Pentagon’s most expensive weapon, the U.S. military on Friday grounded their entire fleet of F-35 fighter jets due to potential cracks in its engine components.

f35Ground crews discovered such a crack during a routine inspection in California. CNN.

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The Pentagon said in a statement that it was too early to assess the impact on the nearly $400 billion fleet of jets designed for use by the Navy, Air Force and Marines.

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The program has been beset by cost overruns and various technical problems during development.

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Currently, there are 51 planes in the F-35 fleet.