[lentulusgracchus]

Not really. If the US had supplied F-6s they would have been the old Douglas Skyray naval fighters of the early '50s.

Thought the Skyrays were designated F-4D's, called "Fords" by Navy airdales. They were replaced by the F-4 Phantom II.

[Oztrich Boy]

Originally yes. But when the DoD introduced the common Airforce/Navy allocation system (starting at F-1) in 1962, the Navy aircraft has to be renumbered to fit the system.

In nmost cases this was done by dropping the manufacturers code
North American FJ Fury becoming F-1
McDonnell F2H Banshee, F3H Demon, F4H Phantom II becoming F-2, F-3, F-4 respectively.
Vought F8U Crusader becoming F-8.
Grumman F9F Cougar, F11 Tiger becoming F-9 and F-11.

But for a couple this couldn't be done
. So the Douglas F3D Skynight becsme the F-10, and the F4D Skyray became the F-6.