Whakakihia te rerenga e whai ake nei: Ko te American Expeditionary Forces (A.E.F. or AEF) he hanganga o te United States Army i te Western Front o te Pakanga Tuatahi o te Ao. I whakatuhia te AEF i te Hurae 5, 1917, i Parani i raro i te whakahau a Gen. John J. Pershing. I whawhai tahi me nga ope French, British Army, Canadian Army, me nga waahanga o te ope taua o Ahitereiria ki te Imperial German Army. He iti o nga hoia AEF i whawhai tahi me nga waahanga o te ope taua tau ano ki te ope taua o Austro-Hungary. I āwhina te AEF i te ope French i te Rā o te Hauauru i te wā o te
Aisne Offensive (i te Pakanga o Château-Thierry me te Pakanga o Belleau Wood) i te raumati o 1918, ka whawhai i ana mahi nui i te Pakanga o Saint-Mihiel me te Meuse-Argonne Offensive i te mutunga o te tau 1918.