COLOMBIAN PRESIDENT U.S. Defense Secretary Leon E. Panetta greets Colombian President Juan Manuel Santos in Bogota, Colombia, April 23, 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 (0.06 MB) Credit: VIRIN: 896603-O-SAA37-176.jpg Photo Gallery