The JSF program is now in its 21st or 22nd year. Of the three flavors of F-35 delivered thus far, none are full-mission-capable, and Big AF gave up on the first batch apparently because L-M wanted to gouge We The Taxpayers for "improvements" that were supposed to be "factory standard." Those jets will be used for adversary training, if anything.
Somebody shoulda gone away long ago but JSF was born with a tattoo on its forehead: "TBTF." (Too Big To Fail.)