Special Orders No. 21, May 29, 1917. Orders Sergeants Hamilton Coolidge and Edmund E. Bates to be relieved from the Curtiss Aviation School and to proceed to Boston for instruction at the Massachusetts Institute of Technology.

Letter from Curtiss Aviation School, June 5, 1917. The school certifies that Sergeant Hamilton Coolidge received 1206 minutes of flying instruction, passed the Preliminary Flying Test and is ready to take the Reserve Military Aviators Test.

Certificate of Graduation for Hamilton Coolidge from the United States Schools of Military Aeronautics at the Massachusetts Institute of Technology, July 14, 1917.