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 Brigadier General Robert Emmet Callan, 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 Chief of Staff of the Army Artillery, First Army, General Callan exhibited ability in organization of that unit. Later, as Commanding General of the 33d Coast Artillery Brigade, he displayed high technical ability. Though confronted with innumerable difficulties, he developed the heavy artillery regiments under his command into combat units of remarkable efficiency, which units proved to be of the utmost value during the St. Mihiel and Meuse-Argonne offensives.