The number of Defense Department workers with security clearances has fallen by about 20 percent since fiscal year 2013, according to a recent briefing obtained by the Federation of American Scientists. However, the slides, part of a quarterly report on insider threats and security clearance reform, depict a recent uptick in the number of cleared Pentagon workers with access to classified material. In the first quarter of FY-16, about 2.3 million workers were cleared for and had access to classified...