The Air Force’s sixth generation fighter has officially entered development, the Air Force’s top official confirmed today. “We have now started an [engineering, manufacturing and development] program to do the development aircraft that we’ll take into production,” Air Force Secretary Frank Kendall said during an event at the Heritage Foundation. “We think we’ll have the capability by the end of the decade.” Due to the classified nature of the design effort, Kendall provided few details about the manned sixth-generation fighter that is set to be the centerpiece of the Air Force’s so-called Next Generation Air Dominance family of systems, which...