In other news:
Navy Official Questions Need For JSF Variants | AVIATION WEEK
The problem is that the three US customers have different views of the JSF.
For the Marines, it is existential: they desperately do not want to rely on carrier support, and their current doctrine calls for their amphibious fleet to be autonomous and self-supporting. They are also very powerful politically.
Of all the US services, the Navy gains least from JSF. They have a pretty capable aircraft in production, with some development potential.
The USAF wants the F-35, but has so many on the books that it could afford to trim back if it had to and buy a few F-15s and F-16s.
The run-up to the Defense Acquisition Board review will be interesting.