U.S. Cyber Command has completed its first major exercise. A week of simulated cyber battling took place at Nellis Air Force Base just outside Las Vegas.

Information Week reports, 300 people participated. The good guys versus bad guys simulation used a virtual private network. The bad actors attempted to penetrate systems of the white hats.

Cyber Command personnel fended off most — but not all — of the attacks. Officials said that means there’s more work to be done. Still, Cyber Command’s chief, General Keith Alexander, deemed the exercise a success.

This story is part of Federal News Radio’s daily Cybersecurity Update. For more cybersecurity news, click here.

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