Let’s Talk About NGAD Achieving The e-Series Status And What This Designation Means Let’s Talk About NGAD Achieving The e-Series Status And What This Designation Means A rendering of a potential Next Generation Air Dominance concept. (Photo: Air Force Research Laboratory) The Digital Century Series, or simply e-Series, is meant to facilitate the U.S. Air Force and Space Force’s analog-to-digital metamorphosis. In September 2020, Dr. William Roper, Assistant Secretary of the Air Force for Acquisition, Technology and Logistics and Secretary of the Air Force Barbara Barrett announced for the first time the “e-Series” or “Digital Century Series”. To better explain the concept, Dr. Roper wrote a guidebook, inspired by the 1999 film “Matrix”, which he titled “There is No Spoon”.