U.S. Navy Lt. Kristen Fregoso, attached to Naval Mobile Construction Battalion (NMCB) 133, conducts coliform bacteria testing under UV light source in Riohacha, Colombia, Sept. 21, 2018, during water-well drilling exploration operations as part of Southern Partnership Station 2018. Southern Partnership Station is a U.S. Southern Command-sponsored and U.S. Naval Forces Southern Command/U.S. 4th Fleet-conducted annual deployment focused on subject matter expert exchanges and building partner capacity in a variety of disciplines including medicine, construction and dive operations in the Caribbean, Central and South America. (U.S. Army photo by Staff Sgt. Kalie Frantz)