F-4EJ - all-weather air defense fighter (modified version of F-4E). 138 of 140 were built under licence by Mitsubishi Heavy Industries).
F-4EJ Kai - Upgraded version of F-4EJ with improved avionics, including AN/APG-66J pulse-doppler radar, and ground attack capability, including ASM-1 anti-ship missile.
RF-4EJ - Modified Japanese F-4EJ to operate reconnaissance equipment. Unlike RF-4E, M61 Vulcan is mounted in the nose. 15 were converted.