When replacing the failed F-35, the U.S. should focus on building large numbers of a reliable, lightweight fighter design. EDITOR’S NOTE: This article concludes Mike Fredenburg’s series on replacing the disastrous F-35 Joint Strike Fighter program. Part I explains why the program should be considered a failure and argues that the Trump administration should proactively cancel the F-35. Part II lays out the measures the Pentagon should undertake to bridge the gap between the F-35’s cancellation and the production of a new replacement fighter.