RIYADH GREETING U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, right, greets Saudi Arabian Prince Khalid bin Sultan bin Abdul Aziz al-Saud, assistant defense and aviation minister for military affairs, in Riyadh, Saudi Arabia, Feb. 21, 2011. Mullen is on a weeklong trip through the Middle East to reassure friends and allies of the U.S. commitment to regional stability. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 317109-R-GFO64-849.jpg Photo Gallery