Physician Joseph Marshall Flint, professor of surgery at the Yale School of Medicine, organized Mobile Hospital No. 39 in France — also known as The Yale Unit — the first of its kind in the American Expeditionary Forces. Realizing they would not have the resources they needed to create a general hospital, Flint and his colleagues adopted a French concept for mobile hospitals. Mobile Hospital No. 39 was staffed by Yale medical faculty and students and supported with funds from the Yale Corporation.