 On October 2, Lahm reported to Col. Raynal Bolling, at the headquarters of the Air Service, Zone of the Interior, in Paris, then was summoned to General Headquarters of the American Expeditionary Force (GHQ AEF) in Chaumont.He made inspections of French balloon facilities before going to the headquarters of the French Sixth Army at Vauxbuin on October 15 to observe French Caquot balloons, slated for use by the Air Service, in battle at Soissons.Lahm's orders to return to the United States were rescinded and he was assigned to organize the balloon section of the Air Service headquarters in Paris.