Almost ten years ago NASA developed and tested a microsatellite in space that can do the job. It probably isn't expensive enough. This is what happens when failure is rewarded with more money. SOP for the federal government.
Aren't these the same folks that managed to send a glorified R/C dune buggy to Mars to take photos? You'd think a small, dedicated UAV would be a no-brainer for these guys. Why complicate the the cargo arm?