Probably spying on other countries satellites.
Do spy satellites ever need to be refueled? I would think that this would be something that mini-shuttle could do.
They let the satellite “die” by plunging it in the atmosphere. I know DARPA is working on refueling a satellite but I think that the X-34 and X-37 can do this task.
It’s prohibited to refuel your own satellite in New Jersey; full service only.