Based on a comment and link offered by ShockwaveLover in the UCLASS Update post, the 8000+ nm range spec may be very much less than that. A commenter from another site, claiming to have intimate knowledge of the procedures and terminology, says that the requirement to fly 600 nm and then conduct two orbits (or 1200 nm and one orbit) doesn’t mean what the graphic that accompanied the stated requirement implied it meant. Instead of an orbit being a circle around the carrier’s location, it means an orbit (actually oval racetrack) around the end point of the UAVs travel. In other words, the UAV would fly 600 nm out and then conduct two comparatively miniscule orbits around that end point.
Taking the longest case of 1200 nm out and back plus a single, very small orbit, the range requirement looks to be more on the order of 3000 nm.
This is a completely plausible explanation despite the graphic that strongly implied an orbit around the carrier and I’m inclined to believe it. In addition, it accords much better with my estimation of the range that a UAV would have in that role. We’ll have to wait for confirmation one way or the other.