Sgt. Jackie Bronson and Pvt. Yilan Chang, both water treatment specialists with 40th Composite Supply Company, 45th Sustainment Command, test the pH level of the purified water from the Water in a Box system during a weeklong field-testing and train-the-trainer exercise on Schofield Barracks, Hawaii, Feb. 9-18. The 40th CSC Soldiers will be the first unit in U.S. Army Pacific to field test the Water in a Box system. (U.S. Army photo by, Staff Sgt. Kyle J. Richardson, USARPAC PAO)