Technically you are right, since there were no Naval Flight Officers in the
USAF. However, for years prior to the F-4's entry into the Air Force, the USAF
had non-pilot rear seat officer navigators or radar intercept officers in
F-89s, F-94s and F-101s. These aircraft also had no flight controls in the
rear seat. So, there was quite a precidence set with pilots (not navs) in the
rear seat of a 2 seat fighter, also the USAF had to specify flight controls in
the back seat.