Construction, by the largest labor force assembled in the United States, to build an entire city for 10,000 requiring barracks, training buildings, water and sewer systems, raced at the rate of 10.4 new buildings every day. As one of 16 temporary cantonments, Camp Devens processed and trained more than 100,000 soldiers of the 76th and 12th Divisions. In 1918, it became a separation center for over 150,000 troops upon their return from France. Put on inactive status, it served next as a summer training camp for National Guardsmen, Reservists and ROTC cadets.