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 Evan M. Jack, Royal British Army, for exceptionally meritorious and distinguished service in a position of great responsibility to the Government of the United States, during World War I. As Officer in Charge of maps in British General Headquarters, Lieutenant Colonel Jack rendered valuable and distinguished services to the American Expeditionary Forces, making available to us all the information at his command. He provided for the instruction of American officers on the British front, and supplied us with special technical equipment that could not be obtained elsewhere.