U.S. Army Spc. Jessica Isales and Sgt. Jennifer Rivera, right, both with Delta Company, Water Purification Section, 192nd Brigade Support Battalion, Puerto Rico Army National Guard, review the technical manual of a Lightweight Water Purifier System during training at Cerrillos Reservoir in Ponce, Puerto Rico, Feb. 9, 2013. The Lightweight Water Purifier System exercise is designed to improve the unit's capabilities in the event of a state or federal emergency. (U.S. Army photo by Spc. Wilma Orozco/Released)