Government Accountability Office warns Lockheed Martin’s F-35 Block 4 upgrades face delays and uncertain costs

Government Accountability Office warns Lockheed Martin’s F-35 Block 4 upgrades face delays and uncertain costs

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The Government Accountability Office (GAO) has said Lockheed Martin will need two more years to develop and install reduced Block 4 F-35 upgrades, with details of planned improvements and cost estimates not due until this autumn.

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