NATIONAL HARBOR, MD -- The chief of Air Force mobility operations said he needs more than the 179 KC-46 tankers the service plans to buy through 2028 and laid out some options for pursuing the technology leaps he wants to see in the next fleet of refueling aircraft. Gen. Carlton Everhart told reporters during a Sept. 20 briefing at the Air Force Association's annual conference here that the service is studying what it would look like to potentially skip a...