Wikipedia:
The American Expeditionary Forces (AEF) consisted of the United States Armed Forces sent to Europe under the command of General John J. Pershing in 1917 to help fight World War I . During the United States campaigns in World War I the AEF fought in France alongside French and British allied forces in the last year of the war, against German forces. Some of the troops fought alongside Italian forces in that same year, against Austro-Hungarian forces. The AEF helped the French Army on the Western Front during the Aisne Offensive (at Château-Thierry and Belleau Wood) in June 1918, and fought its major actions in the Saint-Mihiel and Meuse-Argonne Offensives in late 1918. Some photos of officers, uniforms and kit.