180425-N-PQ607-1130 ST. AUGUSTINE, Fla. (April 25,2018) Rear Adm. Sean Buck, left, commander of U.S. Naval Forces Southern Command/U.S. 4th Fleet, and Deputy Chief of the Chilean Navy General Staff Rear Adm. Yerko Marcic Conley conclude the annual Maritime Staff Talks (MST) during the closing ceremony at Castillo de San Marcos. (U.S. Navy photo by Mass Communication Specialist 2nd Class Michael Hendricks/Released)