The jets have amassed more than 141,000 hours in combat since Operation Desert Storm in 1991.
Without key technical data from F-35 manufacturer Lockheed Martin, GAO said military maintainers can't fix some parts — or even learn how to fix them.
GAO said some defense officials believe the true amount of lost spare parts may be even higher.
The 18th Airborne Command and Control Squadron at Robins AFB will serve as the stateside home for the Battlefield Airborne Communications Node fleet.
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