Born out of a major Chinese cyberattack that stole personal information from millions of federal government employees, the Defense Counterintelligence and Security Agency calls itself ‘America’s Gatekeeper.’ 

Now five years into its existence, it’s responsible for overseeing most of the security clearances for government personnel and contractors. DCSA’s director David Cattler, formerly NATO’s Assistant Secretary General for Intelligence and Security, assesses the current threats. 

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