They are pilotless. Ok. That is one job that has been removed from the equation, but take a look at any airforce base. Not everyone is a pilot. The <i>vast</i> majority of personnel are not pilots. These things will still need the engine techs, the avionics people, the ground crew, fuel people, air traffic controllers, all the way down to the guy driving the mule. The net change in manning between an "autonomous" drone and an oldschool drone driven by a pilot in a trailer will be minimal.<p>And many old fighter jets retire as target drones, going on to fly unmanned for perhaps decades. New purpose-build designs might have lower operating costs but their purchase price will always be higher than slapping radio controls onto already-purchased jets.