PRESIDENTIAL PALACE U.S. Defense Secretary Leon E. Panetta, second from left, shakes hands with Chilean President Sebastián Piñera as U.S. Ambassador to Chile Alejandro D. Wolff, far left, and and Chilean Defense Minister Andrés Allamand look on at the Presidential Palace in Santiago, Chile, April 26, 2012. Panetta is on a five-day trip to the region to meet with counterparts and military officials in Colombia, Brazil and Chile to discuss an expansion of defense and security cooperations. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 992813-S-NPP84-104.jpg Photo Gallery