Army Pfc. Allen Pattison, right, explains the capabilities of the Army's 2,000-gallon Hippo system to Army Gen. Frank Grass, chief of the National Guard Bureau in Pacific, Mo. Jan. 5, 2016. Pattison is a water treatment specialist assigned to the Missouri National Guard’s Company A, 311th Brigade Support Battalion. The Hippos are used to transport and store potable water to meet drinking and hygiene needs in field conditions. Missouri Army National Guard photo by Staff Sgt. Christopher Robertson