AGD SYSTEMS is in the process of bringing back six former Royal Air Force Tristars into service.
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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.