Not only is the F-35A (USAF)/F-35B (USMC)/F-35C (USN) the most expensive fighter ever built, it is the last manned fighter the United States will buy. Most of the fighter mafia are resigned to flying drones in the future.
So three of the best combat aircraft to ever grace the skies is going to be replaced by one aircraft that has yet to prove it can fly, let alone successfully function.
Niiiiiiiice.