After months of successful, high profile hacking attacks against U.S. government networks, the leader of the U.S. Computer Emergency Readiness Team (US-CERT) has called it quits, leaving his job without warning or explanation, Information Week reported Monday.

US-CERT, run by the Department of Homeland Security's (DHS) National Cyber Security Division, is on the front line for protecting the government from hackers. It has been run by Randy Vickers since April 2009, when he stepped up to helm the agency.

Despite their watchful eyes, hackers with groups like LulzSec and Anonymous have in recent months gone on a spree unlike any ever seen, breaching servers at the U.S. Navy, Federal Bureau of Investigation (FBI), Central Intelligence Agency (CIA), Department of Defense, the U.S. Senate, NATO and U.S. defense contractors HBGary Federal and Booz Allen Hamilton, to name just a few.

Following Vickers' departure from US-CERT, deputy director Lee Rock will step up to lead the agency while the DHS searches for an appropriate replacement.

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