DENVER -- The Air Force is moving away from a previous aerial refueling modernization blueprint to instead develop what it’s calling the Next-Generation Air refueling System, or NGAS, service acquisition chief Andrew Hunter told reporters this week. NGAS will be a “clean-sheet” design rather than a modified commercial aircraft as was proposed in the KC-Y and KC-Z plans the service had been operating under, Hunter said at the Air and Space Forces Association Warfare Symposium here. The Air Force determined...