Pvt. Elton Barnes, a water treatment specialist with

Pvt. Elton Barnes, a water treatment specialist with 40th Composite Supply Company, 45th Sustainment Brigade, stands in line waiting to try purified water from the Aspen 2000 water purification system while Eric Nelson, a civilian contractor with U.S. Army Rapid Equipping Force, takes a drink during a weeklong field-testing and train-the-trainer exercise on Schofield Barracks, Hawaii, Feb. 9-18. (U.S. Army photo by, Staff Sgt. Kyle J. Richardson, USARPAC PAO)