What type of preemptive steps can be taken to protect U.S. computer networks and would these steps be taken only in cyberspace?

Col. Cedric Leighton (ret) has 26 years experience as a Military Intelligence Officer in the United States Air Force specializing in cyber threats and security, network vulnerabilities and detection, internet privacy and cryptologic training.

A former member of the Joint Staff, Pentagon, under Admiral Mullen and General Pace and Deputy Training Director for the National Security Agency (NSA) serving under General Keith Alexander, Cedric Leighton was responsible for training thousands of NSA military personnel in intelligence and cyber security detection, prevention and assessments.