Bob, 21st century tanker aeroplanes have no need for navigators, air engineers or AEOs. Just a Mission Specialist to optimise the mission requirements and operate the pod control panel whilst the 2 pilots fly and navigate the aeroplane.
The Mission Computer System is used for a variety of functions, including automatic RV calculations and in-flight mission re-planning. It is proving to be more accurate than those expensive computer flight planning systems sold by well-known commercial companies!