A few pursuit patrols of Fokker airplanes were reported as operating in this sector, but it was quite probable that these were new airplanes received as replacements for the Albatross and Pfalz type formerly in use.
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Born in Guthrie, Oklahoma, he joined the Air Service, United States Army in 1917 during World War I. After pilot training in the United States, Lieutenant Robertson was assigned to the 139th Aero Squadron, 2d Pursuit Group, First Army Air Service.
The Air Service, Second Army Air Service was activated on October 12 with Col. Frank P. Lahm as chief, and the Air Service, Third Army Air Service was created immediately after the armistice to provide aviation support to the army of occupation, primarily from veteran units transferred from the First Army Air Service.