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 Lieutenant Colonel (Adjutant General’s Corps) Michael J. O’Brien, 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 Officer in Charge of the Officers’ Division, Adjutant General’s Office, General Headquarters, American Expeditionary Forces, Lieutenant Colonel O’Brien demonstrated the highest professional attainments in the discharge of his multifarious duties. By his zeal, good judgment, and never-failing tact he was responsible in a large measure for the development of the high efficiency of his division. During the demobilization of the American Expeditionary Forces, working without regard to hours, by his tireless energy and exceptional ability he carried to successful completion the various and difficult projects that arose. Later, in charge of the American Expeditionary Forces records in Washington, D.C. he maintained that same high standard of efficiency which marked his work in the Adjutant General’s Office, Headquarters, American Expeditionary Forces.