American Expeditionary Forces

American Expeditionary Forces
G. H. Q. Distinctive Cloth Insignia
Active	1917–1920
Disbanded	August 31, 1920
Country	United States
Branch	United States Army
Role	Command and control
Size	2,057,675 men (1918)
General Headquarters	Chaumont, France
Nickname(s)	AEF
Engagements	World War I Western Front Battle of Cambrai German spring offensive Third Battle of the Aisne Second Battle of the Marne Battle of Soissons Hundred Days Offensive Battle of Saint-Mihiel Second Battle of the Somme Meuse–Argonne offensive Italian Front Battle of Vittorio Veneto
Commanders
Commander in Chief	General of the Armies John J. Pershing
Commander of the Services of Supply	Major General James Harbord
Chief of the Army Air Service	Major General Mason M. Patrick

The American Expeditionary Forces (AEF)^[a] 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 France under the command of then-Major General John J. Pershing. It fought alongside French Army, British Army, Canadian Army, British Indian Army, New Zealand Army and Australian Army units against the Imperial German Army. A small number of AEF troops also fought alongside Italian Army units in 1918 against the Austro-Hungarian Army. The AEF helped the French Army on the Western Front during the Aisne Offensive (at the Battle of Château-Thierry and Battle of Belleau Wood) in the summer of 1918, and fought its major actions in the Battle of Saint-Mihiel and the Meuse-Argonne Offensive in the latter part of 1918.

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