United States Army Ambulance Service

The United States Army Ambulance Service (USAAS) was a unit of the United States Army during World War I. It was established by General Order No. 75 of the War Department in May 1917. It primarily provided medical services to the French, British and Italian Armies during the first World War. In the second World War, the unit aided the British and the Italians. It incorporated the volunteer sections of the American Field Service, which had been formed before the American entry into World War I.