(r to l) Sgt. Maj. of the Army Raymond F. Chandler III visited the Washington Aqueduct to learn more about the USACE’s unique and diverse mission, June 5. USACE Command Sgt. Maj. Karl J. Groninger accompanied Chandler on the tour and both were able to talk to District employees who ensure safe, drinking water for all of the District of Columbia, the City of Falls Church and Arlington County, Va.