United States Army Ambulance Service

The United States Army Ambulance Service (USAAS) was a unit of the United States Army established by the United States Department of War during World War I. It was established by General Order No. 75 of the War Department in May 1917 and was headquartered in Allentown, Pennsylvania.

Source: Wikipedia — United States Army Ambulance Service (CC BY-SA 4.0)