Defense Secretary Leon E. Panetta walks past an honor guard upon his arrival at the military airport in Bogota, Colombia, on Monday, April 23, 2012, on the first stop on his weeklong tour of Latin America. (AP Photo/Fernando Vergara)

Photo by: Fernando Vergara

Defense Secretary Leon E. Panetta walks past an honor guard upon his arrival at the military airport in Bogota, Colombia, on Monday, April 23, 2012, on the first stop on his weeklong tour of Latin America. (AP Photo/Fernando Vergara)