Summary: The Lockheed Martin F-35 Lightning II program has faced significant hurdles with its Block 4 upgrades, leading the U.S. Department of Defense (DoD) to halt acceptance of new jets until issues are resolved. The Block 4 upgrade, part of the Technology Refresh-3 (TR-3), is designed to enhance the aircraft's weapons capacity, target recognition, and electronic warfare capabilities. However, concurrency problems—where development and procurement occur simultaneously—have caused delays, complicating testing and implementation. Читать дальше...