U.S. Navy Rear Adm. Sinclair M. Harris, center, the commander of U.S. Naval Forces Southern Command and the U.S. 4th Fleet, greets Colombian Secretary of Defense Juan Carlos Pinz'n Bueno, in blue, before the opening ceremony of Unitas 54-13 Sept. 7, 2013, in Cartagena, Colombia. Unitas, Latin for "unity," is an annual U.S. Southern Command-sponsored, multinational naval exercise designed to enhance security cooperation and improve coalition operations between South American and U.S. maritime forces. (U.S. Navy photo by Mass Communication Specialist 2nd Class Adam Henderson/Released)