This book is the first publication that documents and displays copies of the drawings, paintings and samples submitted of every officially authorized shoulder sleeve insignia approved in 1918-1919 by General Headquarters, American Expeditionary Forces, by Command of General John J. Pershing as Commander-in-Chief. Covered are the authorized shoulder sleeve insignia of: General Headquarters, Armies, Corps, Divisions, support organizations of the Services of Supply, special units, and Marine Corps Brigades. The author provides a background and brief history of America's entry into World War I, the formation, lineage and campaign credits of the units as well as quotations and pictorial materials from the documents of record relating to the approvals of 193 insignia for eighty primary Army and Marine Corps units serving in the A.E.F. in World War I. They represent the first distinctive shoulder sleeve insignia officially approved. Many of the designs are still used as distinguishing marks for units of the U.S. Army to this day.