Cyber Defense Exercise (CDX) pits teams from the nation’s military academies against one from the National Security Agency. Defense contractor Lockheed Martin coordinates CDX with the NSA, which provides cybersecurity technology to the spy agency. Exercises like CDX allow students to get a feel for what it’s like to be under attack, expert says. Cybersecurity competitions typically have a “red” team that act as adversaries for the students defending their networks. In CDX, the NSA provides the red team.”]