CARTAGENA, Colombia (Sept. 4, 2018) Sailors aboard the Whidbey Island-Class Dock Landing Ship USS Gunston Hall (LSD 44) man the rails as the ship goes underway to begin the at-sea portion of 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)