170929-N-YM856-0091 PUERTO BARRIOS, Guatemala (Sept. 29, 2017) Lt. Cmdr. Joshua Perry, left, Southern Partnership Station (SPS) 17 ashore officer-in-charge, and Cpl. Christopher Robson, assigned to the 8th Engineer Support Battalion, examine a chlorine gas cylinder during a visit to a local water treatment facility. 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)