The University of Washington's Ambulance Corps formed shortly after the United States entered World War I in 1917. It was organized from University of Washington students in the spring of 1917, as a volunteer Red Cross unit, Ambulance Company 12, with D.C. Hall as commanding officer. Ambulance Co. 12 was reorganized into three Sections of the United States Army Ambulance Service. Section 571, with 1st Lieutenant Frederick G. Beattie, departed for France on August 29, 1918, and subsequently served at various points along the Western Front. They returned to the United States in April 1919, and were demobilized in May of 1919.
Frederick G. Beattie enlisted in the U.S. Army on June 17, 1917. He was commissioned as a lieutenant in September, and was subsequently made the commanding officer of 571 Section United States Army Ambulance Service. He served at St. Mihiel and Meuse-Argonne as part of the American Expeditionary Forces from June 1918 to April 1919. He received an honorable discharge in May 1919, and subsequently settled in Michigan.
From the description of Frederick Beattie University of Washington Ambulance Corps scrapbook, 1917-1919. (Unknown). WorldCat record id: 649557709