Telegram to Adjutant General, July 17, 1918
Lipsner wired a telegram to the Adjutant General’s Office acknowledging President Woodrow Wilson's acceptance of his resignation from the Army.
Otto Praeger, second assistant postmaster general, persisted in the idea that Lipsner’s services would be of greater value to the government in the airmail service than in the Army. Lipsner was reluctant to give up his commission in the Army because the country was still at war, but Praeger persuaded him that the airmail system needed him. Lipsner later recounted that, "...on July 15, 1918, my resignation from the Army was approved by the President of the United States, to take effect on that date.”
Lipsner, Captain Benjamin B. The Airmail Jennies to Jets. Chicago, IL: Wilcox & Follett, 1951.