AGD SYSTEMS is in the process of bringing back six former Royal Air Force Tristars into service.
By U.S. DoD photo by Cmdr. Erik Etz, U.S. Navy (U.S. Defenseimgery.mil photo 081009-N-7665E-004) [Public domain], via Wikimedia Commons
Four will operate as aerial refueling tankers while the other two are configured for cargo, passenger and medivac missions.