Stik, iirc, when the Tomcats first entered the fleet, the term was NFO for the rear seat guys in the Tomcat only. I think RIO was used for Navy F-4 backseaters. AF F-4 guys were referred to as GIB (Guy in Back). I suppose with women navy pilots and rio's they'd be called gals in back? Hmmm, mighta crossed a line there. Sorry! :-)