170913-N-YM856-0058 PUERTO BARRIOS, Guatemala (Sept. 13, 2017) Hospital Corpsman 2nd Class Yang Yang, right, a preventive medicine technician assigned to Navy Environmental Preventive Medicine Unit 5, speaks with Guatemalan sailors during a Southern Partnership Station 17 (SPS 17) medical subject matter expert exchange. SPS 17 is a U.S. Navy deployment executed by U.S. Naval Forces Southern Command/U.S. 4th Fleet, focused on subject matter expert exchanges with partner nation militaries and security forces in Central and South America. (U.S. Navy photo by Mass Communication Specialist 2nd Class Brittney Cannady/Released)