This book is the most comprehensive and detailed treatment of the origins, designs, and symbolism for each organizational shoulder sleeve insignia of the American Army in WWI ever published. Covered arfe: the organization, combat history/battle participation of the combat forces (Armies, Corps, and the Regular, National Guard and National Army Divisions), supporting organizations of the Services of Supply and the special troops including the Army Air Service and the Army of Occupation. SELLING POINTS: The most detailed study of WWI U.S. Army insignia ever published Over 800 superb photos including detailed colour and rare WWI era images Exhaustive bibliography of primary and secondary sources for each unit. 800 colour eb/w images