The Air Force is asking industry to provide input about the airframe for the Next Generation Air-Refueling System as the service considers whether to pursue the program at all or simply add enhancements to the existing tanker fleet. The service on Aug. 15 issued a request for information regarding the NGAS airframe, but the actual parameters of its requirements are not available publicly. An attachment listed as “controlled unclassified information” is available for select firms with access to classified material...