CAIRO MEMORIAL U.S. Defense Secretary Chuck Hagel participates in a wreath-laying ceremony at the Unknown Soldier Memorial in Cairo, April 24, 2013. Egypt is Hagel's fourth stop on a six-day trip to the Middle East to meet with defense counterparts. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 872710-C-ZTO78-181.jpg Photo Gallery