The Air Force will not be prepared by 2018 to participate in a proposed F-35 block buy deal, according to the director of the service's F-35 integration office. Maj. Gen. Jeffrey Harrigian told reporters at a Sept. 14 briefing at the annual Air Force Association Conference in National Harbor, MD, that the multiyear proposal from the F-35 joint program office came as the service was constructing its fiscal year 2017 budget request, which left too little time and budget space...