American Expeditionary Forces
The American Expeditionary Forces (AEF) was a formation of the United States Armed Forces on the Western Front during World War I, composed mostly of units from the U.S. Army. The AEF was established on July 5, 1917, in Chaumont, France, under the command of Major General John J. Pershing.
Source: Wikipedia — American Expeditionary Forces (CC BY-SA 4.0)