The Navy had a choice between procuring the A-6F, and RDT&Eing the A-12. They chose the latter, and drove it straight into the ground.
Also, when the A-12 contractual default judgement is finally charged to the Navy, it will wipe out the entire year's Naval Aviation funding line and then some.
Wow love that plane but in today's air environment - yikes. Tough as nails and brought many a crew home shot to hell.