The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Army Distinguished Service Medal to Colonel (Medical Corps) William L. Keller, United States Army, for exceptionally meritorious and distinguished services to the Government of the United States, in a duty of great responsibility during World War I. As Director of the Professional Services, Medical Department, American Expeditionary Forces, Colonel Keller displayed marked ability in the organization and assignment of the forces at his disposal for service in hospitals at the front and in the rear areas. He was discerning in his knowledge of conditions, using his insufficient personnel to the maximum advantage in relieving the suffering of our sick and wounded, and in obtaining prompt treatment for battle casualties. His comprehensive grasp of the problems which presented themselves resulted in the saving of many lives.