Board of Water Supply. This Civil Engineers Training Battalion was organized under the auspices of the Military Lectures Committee chaired by Board of Water Supply Chief Engineer J. Waldo Smith. Here they are on May 11, 1916 in the 71st Regiment Armory, which stood on the corner of East 34th Street and Park Avenue from 1906-71. Two days later, 7,500 engineers marched in the Preparedness Parade with over 130,000 people down Fifth Avenue. May 11, 1916.