 This resulted in his immediate promotion to captain in accordance with another provision of the law.He reported for duty on April 1, 1916, at the Rockwell Field, San Diego, California as Secretary (adjutant) of the Signal Corps Aviation School and President of the Junior Military Aviator Examining Board.On May 29, 1916, Captain Lahm was briefly detached to the 3rd Field Artillery Regiment at Fort Sam Houston, Texas, to practice using captive balloon ascensions for artillery spotting.