NATIONAL HARBOR, MD -- The Air Force has extended its analysis of alternatives exploring next-generation air dominance capabilities, which was supposed to be completed this summer, and top acquisition officials told reporters this week the service is moving away from "a single addition" and more toward a portfolio of capabilities. The Air Force had anticipated completing the AOA in the third quarter of fiscal year 2018, but Acquisition Executive Will Roper and the service's military deputy for acquisition Lt. Gen...