The number of Defense Department workers with clearances declined more than 700,000 in the last two years, according to new numbers reported by the Pentagon in a briefing and obtained by the Federation of American Scientists. According to a slide included in a quarterly report on insider threat and security clearance reform, about 2.4 million workers were cleared for and had access to classified materials in fiscal year 2015, down 117,000 from FY-13. About 1.5 million had clearances but no...