Jim Roche, then-Secretary of the Air Force, made an announcement on October 26, 2001, that all aviation enthusiasts had been waiting for: a winner had been picked to design and build the Joint Strike Fighter. The American people were assured the new jet would enter service in 2008 and be a high-performance replacement for the military’s aging airframes while only costing between $40 million and $50 million. The F-35 has now entered an unprecedented seventeenth year of continuing redesign, test deficiencies, fixes, schedule slippages, and cost overruns. And it’s still not at the finish line. Numerous missteps along the way—from...