Secretary Hagel escorts Secretary-General of the United Nations Ban Ki-moon through an honor cordon and into the Pentagon Secretary of Defense Chuck Hagel, left, escorts Secretary-General of the United Nations Ban Ki-moon through an honor cordon and into the Pentagon in Arlington, Va., on April 18, 2013. Hagel, Ban and their senior advisers will meet to discuss international security issues. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 657715-P-HTM20-674.jpg Photo Gallery