Defense Secretary Chuck Hagel learns about Plan X during a demonstration by the Defense Advanced Research Projects Agency, or DARPA, at the Pentagon, April 22, 2014. Plan X is a program that develops platforms for the Defense Department to assess cyberwarfare in a manner similar to kinetic warfare. Defense Secretary Chuck Hagel learns about Plan X during a demonstration by the Defense Advanced Research Projects Agency, or DARPA, at the Pentagon, April 22, 2014. Plan X is a program that develops platforms for the Defense Department to assess cyberwarfare in a manner similar to kinetic warfare. SHARE IMAGE: Download Image: Full Size (0.4 MB) Tags: Photo Essays Photo By: VIRIN: 042206-F-VMW72-830.jpg Photo Gallery