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In October 1914 Lahm was assigned to the 6th Cavalry at Texas City and [[Harlingen, Texas]] until April 1916. He became a captain on April 1, 1916, and having completed the required four years of troop duty in his branch, was detailed to the [[Aviation Section, U.S. Signal Corps]], which had replaced the Aeronautical Divison as the Army's aviation arm in August 1914. He was transferred to [[Rockwell Field|North Island]], [[San Diego, California]] as Secretary of the Aviation School and President of the Junior Military Aviator Examining Board.
In May 1917, after the United States entered [[World War I]], Captain Lahm became commanding officer of the Army Balloon School at [[Fort Omaha, Nebraska]], and in June was promoted to major. He suffered a broken leg in a fall from a [[polo]] pony in July, and as he was about to start sick leave, was offered a six-week inspection tour of balloon schools, equipment, and operations in both Britain and France.
===Service with the AEF===
He participated in the [[Aisne-Marne]], [[Battle of Saint-Mihiel|St. Mihiel]] and the [[Meuse-Argonne]] offensives, and then in the occupation of a defensive sector. Lahm was inspector of the British and French balloon services and chief of staff, Air Service, First and Second Armies in France. In February 1918 Lahm became a lieutenant colonel and in September he was appointed full colonel.
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