These fleet retirements and reductions are really the first step toward integrating the future force of UCAV's into the Air Force inventory.
An example is the X-45C with the following features. It can:
Cruise at 0.85 Mach speed.
Carry a 4,500--lb. payload.
Fly 40,000 feet with a mission radius of 1,200 nautical miles on internal fuel.
Be refueled by Air-to-Air Refueling
Transport eight 250-lb. Small Diameter Bombs.
Carry auxiliary fuel tanks and other payloads.
Hit a ground target with a 250-lb. inert near-precision-guided weapon.
Operate independently, fully integrate with manned aircraft operations or execute multi-vehicle coordinated operations.
Be deployed from one location and controlled by another.
http://www.boeing.com/defense-space/military/x-45/