The Defense Department says its ongoing reform efforts have saved or are expected to save $18.4 billion between fiscal years 2017 and 2020, but the Government Accountability Office says DOD can't prove it. "Although DOD officials told GAO that the department is making progress implementing the plan's initiatives and achieving cost savings on its broader efforts, DOD provided limited documentation of that progress. As a result, GAO could not independently assess and verify this progress," GAO wrote in a Sept...