By October 1918, the U.S. had more than one million men fighting in the Meuse-Argonne campaign. The Allied Expeditionary Forces' logistic corps, the Services of Supply (SOS), provided critical support to combat forces from behind the lines. A bewildering array of units served in this role, including British women from Queen Mary's Army Auxiliary Corps, African American regiments, a U.S. Marine brigade led by a legendary officer, volunteers from the Salvation Army, Chinese laborers and German prisoners of war. The SOS kept American soldiers at the front supplied with "bullets, bandages and beans" while repairing weapons, producing vast quantities of lumber, buying horses from Spain, operating a massive railroad network, caring for the sick and wounded, fighting fires on troopships, driving trucks under enemy fire and administering a notorious prison. This book gives a full account of perhaps the most overlooked yet crucial military effort of World War I.

Much has been written about the exploits of the American Expeditionary Forces, the men and women sent overseas to fight during World War I, but much less is known about the two million who served in the Army without ever setting foot on foreign soil. This book examines the history of depot brigades, development battalions, U.S. Guards units, Students' Army Training Corps, and other "forgotten" troops charged with training soldiers, guarding installations, and performing myriad other duties. It also chronicles the service of men like actor Jimmy Cagney, author F. Scott Fitzgerald, movie director Frank Capra, children's author Ludwig Bemelmans, and the two million others who served in the United States during the war. At the time, many of these men considered themselves unfortunate cast-offs, doomed to spend the war safe at home while their friends served in combat overseas. But, in the end, it was largely because of them that America could field an effective fighting force.