I've been researching a new project. Looking at CVW deployments, I've see the designation F/A-18C(N). For example, I see that VMFA-251 Thunderbolts flew this variant off the Enterprise during its last cruise and a number of Marine and Navy squadrons have flown it during the 2000s.

Does anybody know what this (N) means and what it adds (or takes away) from an F/A-18C?

Variants

YF-18: Prototype
F/A-18A: Initial production model
F/A-18B: Two-seat combat capable tainer
F/A-18C: Improved F/A-18A model with AIM-120 AMRAAM and added all-weather capability.
F/A-18D: Two-seat model of F/A-18C
F/A-18C: Night Attack Upgraded F/A-18C with all-weather night attack avionics
F/A-18D: Night Attack Upgraded F/A-18D with all-weather night attack avionics
F/A-18D(RC): Reconnaissance model of F/A-18D
F/A-18E: Re-designed enlarged Super Hornet
F/A-18F: Two seat F/A-18E model
Australian Air Force-18A: Export model of F/A-18C specifically for Australia
ATF-18A: Export model of F/A-18D specifically for Australia
CF-18A: Export model of F/A-18A specifically for Canada
CF-18B: Export model of F/A-18B specifically for Canada
CF-188A: In service designation for CF-18A
CF-188B: In service designation for CF-18B
EF-18A: Export model of F/A-18A specifically for Spain
EF-18B: Export model of F/A-18B specifically for Spain
C.15: In service designation for EF-18A
CE.15: In service designation for EF-18B
TF-18A: Initial designation for F/A-18B
F/A-18 HARV: High Angle of attack Research Vehicle

Far as I can tell its a reference to the night attack addition avionics its not a production designation