SMA Raymond T. Chandler, the highest ranking Non-Commissioned Officer in the Army visited the Washington Aqueduct to learn more about the Corps' unique and diverse mission, June 5. USACE Command Sgt. Maj. Karl J. Groninger accompanied SMA Chandler on the tour and both were able to talk to District Employees who ensure safe, drinking water for all of DC, the City of Falls Church and Arlington County, Va.