It has a loiter time of between 14 and 42 hours depending on your trade-off between ordinance and external fuel tanks (with no resulting pilot fatigue since the pilots can do shifts), costs a fraction of what a modern manned fighter does and can carry up to 3,000 pounds of ordinance.
The UAV has long been believed to be the future of aircraft. Correct me if I'm wrong but the one thing I think a UAV still lacks in this role is a close support capability.
Even when the A1 was out of ammo, they could get right down on deck and rock their rudder pedals back and forth with their lowered tailhooks dragging through the elephant grass.