Pentagon Investigator Security Clearance Process

As investigators fill in the blanks regarding Navy Yard shooter Aaron Alexis, Deputy Secretary of Defense Ash Carter said the department will complete three separate reviews in late December, including internal and independent assessments of base safety procedures as well as the security clearance process. Carter said during a Pentagon briefing the "Bottom line is, we need to know how an employee was able to bring a weapon and ammunition onto a DoD installation."