160925-N-AW702-003 GULF OF PANAMA (Sept. 25, 2016) Rear Adm. Sean Buck, Commander, U.S. Naval Forces Southern Command and Commander of U.S. 4th Fleet, speaks to the UNITAS participants aboard expeditionary fast transport ship USNS Spearhead (T-EPF 1). UNITAS is an annual multi-national exercise that focuses on strengthening our existing regional partnerships and encourages establishing new relationships through the exchange of maritime mission-focused knowledge and expertise throughout the exercise. (U.S. Navy Photo by Mass Communication Specialist 1st Class Jacob Sippel/Released)