A 35,000-gallon tank is put into place next to a new general instruction building under construction at the Presidio of Monterey, Calif., March 25, 2013. The U.S. Army Corps of Engineers Sacramento District is overseeing construction of the building, which is designed to reach a silver rating under the Leadership in Energy and Environmental Design program. The 35,000-gallon tank will collect rain water from the building’s roof, which will then be used to help supply the building’s plumbing system. (U.S. Army Photo by Jack Davies/Released)