Col. David Preston, USARPAC sustainment division chief, tries 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 WiaB can produce several days of water for a company-sized element. (U.S. Army photo by, Staff Sgt. Kyle J. Richardson, USARPAC PAO)