Inside the Pentagon's secretive preparations for a 'cyber 9/11'
About half of the participants were from CYBERCOM. The others included civilians from the Department of Homeland Security, the FBI and other government agencies, and private sector officials from energy companies, major port facilities and privately owned internet service providers. The training network, built specifically for this exercise, replicates military and private-sector communications systems but is not connected to the internet. Training on an internet connection would risk releasing classified — or potentially catastrophic — code-based weaponry into the public realm.