TECHNOLOGY SHOWCASE Arati Prabhakar, the director of the Defense Advanced Research Projects Agency, or DARPA, briefs Defense Secretary Chuck Hagel on the Atlas robot and other robotics at the Pentagon, April 22, 2014. The program showcased DARPA technologies and how they contribute to U.S. national security. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 014477-D-PLN06-119.jpg Photo Gallery