The first change of command at U.S. Cyber Command is complete. General Keith Alexander made way for Admiral Mike Rogers recently. But new revelations from Edward Snowden are a reminder that the first four years of the combination of CYBERCOM and the National Security Agency aren’t without controversy. William Lynn was Deputy Secretary of Defense when the Defense Department stood up Cyber Command. He wrote about the strategy behind it in Foreign Policy at the time. He is now Chief Executive Officer of Finmeccanica North America and DRS Technologies. He explained on In Depth with Francis Rose the chain of events that caused DoD leadership to stand up Cyber Command.