IIRC the D's would all be wired for the radar, but there would be fewer of them than D's, so the ones with radar would be called "Longbow" and the ones without just "Apache." In the event I think they decided to go ahead and wire them all for the radar, I guess to avoid the scenario of having no D's ready for a mission but C's and working radars in evidence.

BTW...the latest F-16, the Block 60, was officially redesignated from F-16C/D Blk 60 to F-16E/F. The semi-official useage of it for the XL program (that lost to the F-15E in the 80s) was set aside.



The Jedi Master