Scope and Contents Certificate, September 29, 1917. Acknowledges Hamilton Coolidge's receipt of a commission to be 1st Lieutenant in the Aviation Section of the Signal Officers' Reserve Corps of the Army of the United States.Certificate, March 28, 1925. Awards the Distinguished Service Cross to Captain Hamilton Coolidge.Certificate in Memory of Hamilton Coolidge, October 27, 1918.Certificate "a la memoire de Hamilton Coolidge."Certificate for the French Croix de...