The F-4E has never been a naval variant. For naval variants you want the F-4B, F-4J, F-4N, F-4S or F-4K (Phantom FG1). There was also a USN F-4G back in the 60's that had updated nav suite and ACLS... it only made one war cruise in Vietnam before the jets were converted back to F-4B's and the designation dropped. The USAF, in the late 70's then picked the F-4G designation up for the Wild Weasel V modified F-4E's it was replacing the F-105G Wild Weasel III airframes with.