CAIRO, EGYPT - JULY 31:  U.S. Secretary of Defense Leon Panetta (R) is greeted by Egyptian Defense Minister Mohamed Hussein Tantawi (L), upon arriving at the Defense Ministry on July 31, 2012 in Cairo, Egypt. Secretary Panetta is on a four day trip to the Middle-East with stops in Tunisia, Egypt, Israel and Jordan before returning to Washington.  (Photo by Mark Wilson/Getty Images)