Future combat in space. And present combat in space too - since one of two satellites was designed and built and then launched 5 years ago.
But.
A stable, close robot-controlled remote rendezvous is necessary for refueling rendezvous and hookup, but is not necessarily a successful refueling. Yet.
I say future combat only in the sense that currently we do not have satellite to satellite or satellite to surface combat actively going on. As in, this could literally start tomorrow.
It’s not a proven refueling and resupply operation yet, no, but it’s the hard part done. The rest is just engineering details if they haven’t already accomplished it.