180902-N-GX781-0117 CARTAGENA, Colombia (Sept. 2, 2018) Rear Adm. Sean Buck, commander of U.S. Naval Forces Southern Command, addresses the crew of the Whidbey Island-class dock landing ship USS Gunston Hall (LSD 44) over the ship's announcement system. The Gunston Hall is in Cartagena, Colombia for UNITAS 2018. UNITAS is an annual international exercise in the U.S. Southern Command area of responsibility where partner nations participate in multinational exchanges to enhance interoperability, increase regional stability, and build and maintain regional relationships with countries throughout the region through joint, multinational and interagency exchanges and cooperation. (U.S. Navy photo by Mass Communication Specialist 3rd Class Colbey Livingston/Released)